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Observing Opportunity

Observation Opportunity
Jupiter Opposition

Saturday January 10, 2026 Sunset

This opportunity is provided if clear skies prevail at sunset. Check back here the afternoon before event for final weather call.

Enter Before Sunset as main gate Closes at Sunset 5:00 PM

Heated bathroom access till 10:00 PM / Visitor Center is not open
No overnight Observing visitors must vacate by 11:00 PM


If you arrive and gate is not open, line up on right side of entrance driveway.
Gate will open again from 6:00 through 6:10 PM
Gate opens again from 7:00 through 7:10 PM
No Entrance after 7:10 PM
(headlights coming up the hill destroy dark adaptation)

Members and their guests, Volunteers, Amateurs (from any astronomy group or society, and those interested in membership) are welcome to set up their own personal gear to observe from the amphitheater of the Ryan Observatory. This opportunity provides a secure dark sky location and practice with your equipment. With good conditions, we can see the Milky Way from the Observatory site.  Remember to dress warm.

Clear Sky Chart / Smoke Chart

Sunset 4:59 PM
Nightfall 6:35 PM

Bring your own personal gear to observe.

A Rittenhouse Representative will be on site at Astronomical Twilight to turn of lighting for deep sky observation and photography.

Rittenhouse Astronomical Society

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December 21

Observing Opportunity

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March 21

Messier Marathon Observing Opportunity