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Public Observing June 11, 2016 

8:00 p.m. to 10:00 p.m.

At John Rudy Park, York, PA. Observatory

The York County Astronomical Society, Inc. is a non-profit organization dedicated to the advancement of the science of astronomy.

Expand your mind by taking in the expanse of the universe.

Come and view the night skies with us through one of our telescopes and let our experienced members guide you on a tour of celestial wonders, including stars, planets, nebulae, and the moon. You are also invited to bring your own telescope and share your experiences with other amateur astronomers. Star Charts are available to help your exploration of the nighttime sky.

For all observing activities at John Rudy Park, if the weather is questionable, please check our voice message at 949-963-9147 for notice of any late cancellation or for an updated status, check this website.

To Observatory See: Directions

 If it is clear or mostly clear, the activity will 
occur as scheduled. If it is completely cloudy, raining or snowing, the activity will be cancelled.

For information on events, scheduling a private party star watch, directions to the observing site, or for general Society information please email YCAS at: E-Mail YCAS

The Public Observing Night Sky


The Sun sets at 8:36 p.m. and is located in the constellation Taurus the Bull.


The moon is in the southwest in the constellation Leo the Lion and is at phase 47.21% lit. The planet Jupiter is only 0347'53" (degrees) to the right of the moon as seen in below image. The moon sets at 12:50 am. See: How to find degrees.


Mars appears larger and brighter than at any time in the last 10 years. Mars will be located in the constellation Libra in the southeast. Above image shows Mars surface at 10:00 pm. on Public Observing night.

Optical and Radio Telescope Astronomy 

Planets Visible for Public Observing


Jupiter the fifth planet from the Sun is the largest planet in the Solar System. It has a mass one-thousandth that of the Sun. Jupiter is located in the southwest at 9:30 pm this night located in the constellation Leo the Lion. Jupiter sets at 1:20 am. When you look at Jupiter your seeing the planet as it appeared 36 minutes ago due to the 467,790,000 million miles it takes light traveling at 186,000 miles per second to reach your eyes from Jupiter.

Observe four of Jupiter's moons. See below image of the planet Jupiter and moons as they will appear through a small telescope at 10:00 pm. June 11th.

Below image at 9:00 pm shows the shadow of Europa as it ends its transit across the face of Jupiter.

19:56 UT, Europa begins transit of Jupiter.
22:30 UT, Europa's shadow begins to cross Jupiter.
22:44 UT, Europa ends transit of Jupiter.


Saturn the ringed planet  is rising low in the southeast located in the constellation Ophiuchus. Image below shows the moons of Saturn at 9:30 pm public observing night.


Rising in the east are the constellations Lyra, Ophiuchus, Libra and Hercules. Low in the southeast is Scorpius and in the southwest the constellation Hydra. High in the sky is Virgo, Coma Berenices, Cane Venatici and Bootes. Higher in the western sky is the constellation Leo the Lion and below Leo is the constellation Cancer and just above the horizon are setting constellations Gemini the Twins and Auriga. In the north is the Big Dipper above the Little Dipper with Polaris the north star. See How to use the Big Dipper to find Polaris the north star. See: Finding North Star. These are just a few of the many constellations visible this night.

View the June 11, 2016  Night Sky Below

North - South - East - West - Zenith

 Take a memorable tour with members of the York County Astronomical Society of Galaxies, planets, the moon and the constellations of the night sky.

Stars and Constellations Astronomical Pronunciation Guide

Directions to Observatory

See: Directions

Explore the Wonders of your Universe

Astronomy Picture of the Day

The Known Universe


Our sun is almost one million miles in diameter and a million earths would fit in it.

It takes light eight minutes to reach us from the sun. 

The last star shown in video is VY Canis Majoris which takes light about 5000 years to reach us that is light traveling at 186,000 miles per second x 60 seconds in a minute x 60 minutes in an hour x 365 days in a year x 5000 years. VY Canis Majoris is (almost 2 billion ) 1.7 billion miles in diameter. 


 What does light pollution look like?

What does your nighttime sky look like? Try this fun interactive game to see how light pollution affects the stars you see at night: 

Light Pollution also see: Globe At Night

International Dark Sky Association

See Weather and Directions map below.


Directions to Observatory

See: Directions

The GPS coordinates of the observatory are: N40.024400 W076.704700



The York County Astronomical Society holds a public observing session every month, check this website for times. 

The club's telescopes will be used to show the public many of the fascinating objects that are up in the nighttime sky. We will also be showing people how to use Star charts to identify the stars and constellations that are up in the nighttime sky. The public is encouraged to bring their own telescopes, if they have one, to learn how to use them more effectively. If you are interested in buying a telescope, this is a great place to ask questions.

For information on events, scheduling a private party star watch, directions to the observing site, or for general Society information please email YCAS at: E-Mail YCAS Membership applications are available upon request.

Contact us for Scouts Astronomy Merit badge program.

Please Observe Below

While on the observatory's premises: no smoking, food, pets (except guide dogs) or flash photography is permitted, thank you. In accordance with the ADA, those with disabilities who wish to gain access within York County Parks should telephone the County of York human services offices at (949-963-9147).

The York County Astronomical Society, Inc. is a non-profit organization dedicated to the advancement of the science of astronomy to all concerned Unless otherwise advertised, Most star watches are held at our observatory, located in John Rudy County Park, at 400 Mundis Race Road in York County, Pennsylvania, 17402 , they are free and open to the public. If you have a red-filtered flashlight please bring it along. 


YCAS SCHEDULE See: YCAS Schedule page for more dates

Need help with your telescope? See New Telescope Clinic.

Check out the new show at the YCAS Planetarium. Go to Planetarium link.

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