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Blue Hill Observatory Science Center Inc

Milton, Massachusetts · EIN 22-2517414 · tax-exempt since 1985

B

Charity Clarity grade B (score 68.9 of 100), based on the Form 990 for the year ended August 2025.

Graded against 88,048 unclassified nonprofits with revenue $500K–$2M filing the same form. A = top 10%, B = next 20%, C = middle 40%, D = next 20%, F = bottom 10%.

What goes into the grade

MeasureThis charityScore (0–100)
ReservesMonths of spending covered by unrestricted net assets.7.8 months97
GovernanceBoard independence, key policies and audit, per the 990.82% of practices82
Margin stabilityHow steady the surplus or deficit is year to year.26
Revenue spreadHow much revenue rests on one type of income.82% from one source34
Filing recordOn-time, complete filings, year after year.100%100
Program spendingSelf-reported by the filer.74.3%not scored
Management costsShare of spending.6.0%not scored
Cost to raise $1Fundraising cost per dollar given.$0.16not scored

Scores compare this charity with its peer group; 100 is best. How Charity Clarity rates charities.

Year by year

201620172018202020212022202320242025grey: revenue · green: spending
Year endedFormRevenueSpendingSurplusNet assetsMonths of spendingStaffGrade
Aug 2025Form 990$628K$626K$2,348$406K7.814B
Aug 2024Form 990$547K$669K−$122K$403K7.215C
Aug 2023Form 990$559K$397K$161K$526K15.914C
Aug 2022Form 990$526K$392K$135K$364K11.29B
Aug 2021Form 990$361K$278K$83K$229K9.913C
Aug 2020Form 990$289K$323K−$35K$146K5.414C
Aug 2018Form 990$307K$264K$43K$166K7.614C
Aug 2017Form 990$233K$258K−$25K$123K5.713C
Aug 2016Form 990$322K$266K$56K$148K6.714C

From the organisation’s own IRS filings. “Months of spending” is total net assets divided by a month of that year’s spending. A blank grade means that year was not rated.

Read the filings

Every figure here comes from the returns this charity filed with the IRS. These sites show the full returns and more about the organisation: