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Astronomical Observatory: Hours

Hours for the Observatory

Calvin Observatory is open to the public on clear Wednesday evenings throughout the year (excepting only the last two weeks of December). All are welcome. Larger groups should call the observatory director (Prof. Larry Molnar, 526-6341) in advance. If in doubt about the weather, you may call the telescope dome directly at 526-6435.

Summer hours

During the summer, the observatory is only open on clear Wednesday evenings, and all are welcome. The dome opens one half hour after sunset, and remains open until midnight. See the table at right for sunset times.

Fall and spring semester

During the fall and spring semesters, the Observatory is open to Calvin students clear evenings Monday through Thursday, and to the general public on Wednesday nights. The dome opens at 7:30 pm or one half hour after sunset (whichever comes later), and remains open until 11 pm. See the table at right for sunset times.

Christmas break

The observatory is closed over Christmas break: the last two weeks of December.


During January interim, the observatory is only open on clear Wednesday nights, and all are welcome. The dome is open from 7:30 to 11 pm.

Wheelchair access: Although the Calvin dome, constructed in 1969, is not accessible by wheelchair, we have portable telescopes. Viewing sessions will be arranged on request. Call the observatory director (Larry Molnar, 526-6341) to arrange time and place.


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Astronomical Calendars

Calvin College (EST)



Rehoboth, NM (MST)



Nautical Twilight

Daylight Saving Time: When DST is in effect, add one hour to the time given in the tables above.

Daylight Saving Time begins at 2:00 am on the second Sunday in March (at which time clocks are advanced) and end at 2:00 am on the first Sunday in November (at which time clocks are moved back). For the year 2019, DST begins March 10 and ends November 3.