Liabilities / Assets
60th percentile
Tied with the lowest-debt nonprofits in its peer group.
EIN 91-6058371 • 501(c)3 • Seattle, WA
Profile
Astronomy education and outreach.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
60th percentile
Tied with the lowest-debt nonprofits in its peer group.
Liabilities / Revenue
62nd percentile
Tied with the lowest-debt nonprofits in its peer group.
Net Margin
94th percentile
Higher net margin than 94% of similar nonprofits.
Top Officer Pay
81st percentile
Higher top officer pay than 81% of similar nonprofits.
Top officer pay equals 0.0% of source-year revenue.
Asset Growth
Score unavailable
No earlier valid filing was available within the previous three public years.
Revenue Growth
Score unavailable
No earlier valid filing was available within the previous three public years.
Assets
$129,259
No earlier filing loaded for comparison.
Liabilities
$0
No earlier filing loaded for comparison.
Net Assets
$129,259
No earlier filing loaded for comparison.
Revenue
$75,163
No earlier filing loaded for comparison.
Expenses
$22,093
No earlier filing loaded for comparison.
Net Income
$53,070
No earlier filing loaded for comparison.
Most recent year
2024 • Form 990EZDetailed filing. Detailed filing data is available for this year.
Astronomy education and outreach.
| Description | Grants | Expenses |
|---|---|---|
| MAINTAINING DARK SKY SITE IN GOLDENDALE, WA. DARK SKY SITE IS DEDICATED FOR USE BY MEMBERS (EST. 500+) TO OBSERVE THE NIGHT SKIES AWAY FROM LIGHT POLLUTION AND FOR HOSTING OUTREACH EVENTS. | $0 | $6,777 |
| HOSTING REGULAR MONTHLY STAR PARTIES OPEN TO THE PUBLIC AT SEVERAL LOCATIONS AROUND SEATTLE AND HOSTING MONTHLY MEETUPS FOR MEMBERS WITH GUEST SPEAKERS. BENIFITS MEMBERS (EST. 500+) AND THE PUBLIC. | $0 | $3,709 |
| PROVIDING FREE TELESCOPE EQUIPMENT LOANS FOR MEMBERS (EST. 500+) RANGING FROM BEGINNER TO ADVANCED EQUIPMENT. | $0 | $891 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| ALAN SPURGEON | President & Webmaster | FT | $0 | - | - |
| KEITH KRUMB | Vice President Of Activities | FT | $0 | - | - |
| JENNIFER FRICKS | Vice President Of Membership | FT | $0 | - | - |
| CATIE CHARNOCK | Vice President Of Publicity | FT | $0 | - | - |
| CRYSTAL KAYA | Secretary | FT | $0 | - | - |
| STEPHEN VAN ROMPAEY | Treasurer (Old) | FT | $0 | - | - |
| LIZ THORN | Treasurer (New) | PT | $0 | - | - |
| BOB MULFORD | Vice President Of Equipment | FT | $0 | - | - |
| WENDY FROGGATT | Vice President Of Outreach | FT | $0 | - | - |
| DAVID HOOVER | Astronomical League Coordinator | FT | $0 | - | - |
| MATT DAHL | Astrophotography Special Interest Group | FT | $0 | - | - |
| AARON YOON | Bipoc Special Interest Group | FT | $0 | - | - |
“Meetings expense = $2,326, dark sky site supplies = $2,707, equipment lease = $1,284, depreciation = $4,426”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990EZ/ActivitiesNotPreviouslyRptInd | 0 | 0 |
| IRS990EZ/BenefitsPaidToOrForMembersAmt | 0 | 0 |
| IRS990EZ/BooksInCareOfDetail/PersonNm | 0 | LIZ THORN |
| IRS990EZ/BooksInCareOfDetail/PhoneNum | 0 | 2063038848 |
| IRS990EZ/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 4056 NE 86TH ST |
| IRS990EZ/BooksInCareOfDetail/USAddress/CityNm | 0 | SEATTLE |
| IRS990EZ/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | WA |
| IRS990EZ/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 98115 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/BOYAmt | 0 | 62647 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/EOYAmt | 0 | 51471 |
| IRS990EZ/ChgMadeToOrgnzngDocNotRptInd | 0 | 0 |
| IRS990EZ/ContributionsGiftsGrantsEtcAmt | 0 | 58203 |
| IRS990EZ/CostOfGoodsSoldAmt | 0 | 0 |
| IRS990EZ/CostOrOtherBasisExpenseSaleAmt | 0 | 0 |
| IRS990EZ/DirectIndirectPltclExpendAmt | 0 | 0 |
| IRS990EZ/DonorAdvisedFndsInd | 0 | 0 |
| IRS990EZ/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990EZ/ExcessOrDeficitForYearAmt | 0 | 53070 |
| IRS990EZ/FeesAndOtherPymtToIndCntrctAmt | 0 | 500 |
| IRS990EZ/FiledScheduleAInd | 0 | 1 |
| IRS990EZ/ForeignFinancialAccountInd | 0 | 0 |
| IRS990EZ/ForeignOfficeInd | 0 | 0 |
| IRS990EZ/Form1120PolFiledInd | 0 | 0 |
| IRS990EZ/Form990TotalAssetsGrp/BOYAmt | 0 | 76189 |
| IRS990EZ/Form990TotalAssetsGrp/EOYAmt | 0 | 129259 |
| IRS990EZ/FundraisingGrossIncomeAmt | 0 | 10546 |
| IRS990EZ/GainOrLossFromSaleOfAssetsAmt | 0 | 0 |
| IRS990EZ/GamingGrossIncomeAmt | 0 | 0 |
| IRS990EZ/GrantsAndSimilarAmountsPaidAmt | 0 | 0 |
| IRS990EZ/GrossProfitLossSlsOfInvntryAmt | 0 | 0 |
| IRS990EZ/GrossReceiptsAmt | 0 | 86608 |
| IRS990EZ/GrossSalesOfInventoryAmt | 0 | 0 |
| IRS990EZ/InfoInScheduleOPartIInd | 0 | X |
| IRS990EZ/InvestmentIncomeAmt | 0 | 0 |
| IRS990EZ/LandAndBuildingsGrp/BOYAmt | 0 | 13542 |
| IRS990EZ/LandAndBuildingsGrp/EOYAmt | 0 | 77788 |
| IRS990EZ/LobbyingActivitiesInd | 0 | 0 |
| IRS990EZ/MadeLoansToFromOfficersInd | 0 | 0 |
| IRS990EZ/MembershipDuesAmt | 0 | 17859 |
| IRS990EZ/MethodOfAccountingCashInd | 0 | X |
| IRS990EZ/NetAssetsOrFundBalancesBOYAmt | 0 | 76189 |
| IRS990EZ/NetAssetsOrFundBalancesEOYAmt | 0 | 129259 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/BOYAmt | 0 | 76189 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/EOYAmt | 0 | 129259 |
| IRS990EZ/OccupancyRentUtltsAndMaintAmt | 0 | 10850 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 0 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 1 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 2 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 3 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 4 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 5 | 148.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 6 | 20 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 7 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 8 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 9 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 10 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 11 | 168 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 4 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 5 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 6 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 7 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 8 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 9 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 10 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 11 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 4 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 5 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 6 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 7 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 8 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 9 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 10 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 11 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 4 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 5 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 6 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 7 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 8 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 9 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 10 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 11 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 0 | ALAN SPURGEON |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 1 | KEITH KRUMB |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 2 | JENNIFER FRICKS |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 3 | CATIE CHARNOCK |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 4 | CRYSTAL KAYA |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 5 | STEPHEN VAN ROMPAEY |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 6 | LIZ THORN |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 7 | BOB MULFORD |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 8 | WENDY FROGGATT |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 9 | DAVID HOOVER |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 10 | MATT DAHL |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 11 | AARON YOON |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 0 | PRESIDENT & WEBMASTER |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 1 | VICE PRESIDENT OF ACTIVITIES |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 2 | VICE PRESIDENT OF MEMBERSHIP |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 3 | VICE PRESIDENT OF PUBLICITY |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 4 | SECRETARY |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 5 | TREASURER (OLD) |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 6 | TREASURER (NEW) |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 7 | VICE PRESIDENT OF EQUIPMENT |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 8 | VICE PRESIDENT OF OUTREACH |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 9 | ASTRONOMICAL LEAGUE COORDINATOR |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 10 | ASTROPHOTOGRAPHY SPECIAL INTEREST GROUP |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 11 | BIPOC SPECIAL INTEREST GROUP |
| IRS990EZ/OperateHospitalInd | 0 | 0 |
| IRS990EZ/Organization501c3Ind | 0 | X |
| IRS990EZ/OrganizationDissolvedEtcInd | 0 | 0 |
| IRS990EZ/OrganizationHadUBIInd | 0 | 0 |
| IRS990EZ/OtherAssetsTotalDetail/BOYAmt | 0 | 0 |
| IRS990EZ/OtherAssetsTotalDetail/EOYAmt | 0 | 0 |
| IRS990EZ/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990EZ/OtherExpensesTotalAmt | 0 | 10743 |
| IRS990EZ/OtherRevenueTotalAmt | 0 | 0 |
| IRS990EZ/PartVIHghstPdCntrctProfSrvcTxt | 0 | NONE |
| IRS990EZ/PartVIOfCompOfHghstPdEmplTxt | 0 | NONE |
| IRS990EZ/PoliticalCampaignActyInd | 0 | 0 |
| IRS990EZ/PrimaryExemptPurposeTxt | 0 | ASTRONOMY EDUCATION AND OUTREACH. |
| IRS990EZ/PrintingPublicationsPostageAmt | 0 | 0 |
| IRS990EZ/ProgramServiceRevenueAmt | 0 | 0 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/DescriptionProgramSrvcAccomTxt | 0 | MAINTAINING DARK SKY SITE IN GOLDENDALE, WA. DARK SKY SITE IS DEDICATED FOR USE BY MEMBERS (EST. 500+) TO OBSERVE THE NIGHT SKIES AWAY FROM LIGHT POLLUTION AND FOR HOSTING OUTREACH EVENTS. |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/DescriptionProgramSrvcAccomTxt | 1 | HOSTING REGULAR MONTHLY STAR PARTIES OPEN TO THE PUBLIC AT SEVERAL LOCATIONS AROUND SEATTLE AND HOSTING MONTHLY MEETUPS FOR MEMBERS WITH GUEST SPEAKERS. BENIFITS MEMBERS (EST. 500+) AND THE PUBLIC. |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/DescriptionProgramSrvcAccomTxt | 2 | PROVIDING FREE TELESCOPE EQUIPMENT LOANS FOR MEMBERS (EST. 500+) RANGING FROM BEGINNER TO ADVANCED EQUIPMENT. |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/GrantsAndAllocationsAmt | 0 | 0 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/GrantsAndAllocationsAmt | 1 | 0 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/GrantsAndAllocationsAmt | 2 | 0 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/ProgramServiceExpensesAmt | 0 | 6777 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/ProgramServiceExpensesAmt | 1 | 3709 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/ProgramServiceExpensesAmt | 2 | 891 |
| IRS990EZ/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990EZ/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990EZ/SalariesOtherCompEmplBnftAmt | 0 | 0 |
| IRS990EZ/SaleOfAssetsGrossAmt | 0 | 0 |
| IRS990EZ/ScheduleBNotRequiredInd | 0 | X |
| IRS990EZ/SchoolOperatingInd | 0 | 0 |
| IRS990EZ/SpecialEventsDirectExpensesAmt | 0 | 11445 |
| IRS990EZ/SpecialEventsNetIncomeLossAmt | 0 | -899 |
| IRS990EZ/StatesWhereCopyOfReturnIsFldCd | 0 | WA |
| IRS990EZ/SubjectToProxyTaxInd | 0 | 0 |
| IRS990EZ/SumOfTotalLiabilitiesGrp/BOYAmt | 0 | 0 |
| IRS990EZ/SumOfTotalLiabilitiesGrp/EOYAmt | 0 | 0 |
| IRS990EZ/TanningServicesProvidedInd | 0 | 0 |
| IRS990EZ/TaxImposedOnOrganizationMgrAmt | 0 | 0 |
| IRS990EZ/TaxImposedUnderIRC4911Amt | 0 | 0 |
| IRS990EZ/TaxImposedUnderIRC4912Amt | 0 | 0 |
| IRS990EZ/TaxImposedUnderIRC4955Amt | 0 | 0 |
| IRS990EZ/TaxReimbursedByOrganizationAmt | 0 | 0 |
| IRS990EZ/TotalExpensesAmt | 0 | 22093 |
| IRS990EZ/TotalProgramServiceExpensesAmt | 0 | 11377 |
| IRS990EZ/TotalRevenueAmt | 0 | 75163 |
| IRS990EZ/TransactionWithControlEntInd | 0 | 0 |
| IRS990EZ/TrnsfrExmptNonChrtblRltdOrgInd | 0 | 0 |
| IRS990EZ/TypeOfOrganizationCorpInd | 0 | X |
| IRS990EZ/WebsiteAddressTxt | 0 | WWW.SEATTLEASTRO.ORG |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearAmt | 0 | 86608 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus1YearAmt | 0 | 30805 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 28479 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 16381 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 15876 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/TotalAmt | 0 | 178149 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeCYPct | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomePYPct | 0 | 1 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/PubliclySupportedOrg509a2Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY509Pct | 0 | 1 |
| IRS990ScheduleA/PublicSupportPY509Pct | 0 | 1 |
| IRS990ScheduleA/PublicSupportTotal509Amt | 0 | 178149 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearMinus1YearAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY509Ind | 0 | X |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearAmt | 0 | 86608 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus1YearAmt | 0 | 30805 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 28479 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 16381 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 15876 |
| IRS990ScheduleA/Total509Grp/TotalAmt | 0 | 178149 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearAmt | 0 | 86608 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus1YearAmt | 0 | 30805 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus2YearsAmt | 0 | 28479 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus3YearsAmt | 0 | 16381 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus4YearsAmt | 0 | 15876 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/TotalAmt | 0 | 178149 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | MEETINGS EXPENSE = $2,326, DARK SKY SITE SUPPLIES = $2,707, EQUIPMENT LEASE = $1,284, DEPRECIATION = $4,426 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Form 990-EZ, Part I, Line 16 |
| ReturnHeader/BuildTS | 0 | 2025-03-06 01:10:19Z |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | Liz Thorn |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | Treasurer |
| ReturnHeader/BusinessOfficerGrp/PhoneNum | 0 | 2063038848 |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2025-11-14 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | SEATTLE ASTRONOMICAL SOCIETY INC |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | SEAT |
| ReturnHeader/Filer/EIN | 0 | 916058371 |
| ReturnHeader/Filer/PhoneNum | 0 | 2063038848 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | PO BOX 31746 |
| ReturnHeader/Filer/USAddress/CityNm | 0 | SEATTLE |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | WA |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 98103 |
| ReturnHeader/IRSResponsiblePrtyInfoCurrInd | 0 | 0 |
| ReturnHeader/ReturnTs | 0 | 2025-11-14T21:23:11-07:00 |
| ReturnHeader/ReturnTypeCd | 0 | 990EZ |
| ReturnHeader/TaxPeriodBeginDt | 0 | 2024-01-01 |
| ReturnHeader/TaxPeriodEndDt | 0 | 2024-12-31 |
| ReturnHeader/TaxYr | 0 | 2024 |
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