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Visiting PMO in September (2018)

Note: No additional tours for Labor Day weekend; Friday and Saturday (Aug. 31-Sept. 1) only. Also, the final weekend for tours at PMO this year is Sept. 14-15.

Sunsets at PMO continue to rapidly become earlier in September – from about 7:40 p.m. at the outset to before 7:00 p.m. at the end. Please arrive early (by sunset), especially if you want to see Jupiter and Saturn. (Jupiter is now low in the southwestern sky and will only be observable in PMO’s 24-inch telescope during evening twilight). Also, keep in mind that temperatures may dip into the 30s or 40s at night in September, even if it’s relatively warm in town during the day. Check the PMO weather page before heading out. Public viewing may conclude by 11 p.m. (or sooner if the weather is poor)

Moon information:

Aug. 31-Sept. 1 – moon rises by about 11 p.m. (10:35 p.m. on Friday), which will allow over one hour of “dark sky” viewing after the end of twilight at about 9:20 p.m.

Sept. 7-8 – moon rises very late and won’t interfere with viewing; new moon is on Sunday Sept. 9.

Sept. 14-15 – crescent moon (almost first quarter by Saturday night) sets by about 10:30 p.m. on Friday and 11:00 p.m. on Saturday, allowing “dark sky” viewing if you stay later. Be sure to arrive right around sunset if you want to see the moon itself.

Planets: Besides Jupiter, Saturn and Mars, Uranus and Neptune will be visible later (by about 11 p.m. for Uranus and any time after dark for Neptune).

After September 15, we’re done with tours for the season, so don’t delay, or you’ll have to wait until next May. Thank you for your interest in PMO!

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