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Public Observing August 13, 2016

8:00 p.m. to 11:00 p.m.

At John Rudy Park, York, PA. Observatory

There will be an Astronomy Program in the Observatory August 13th if cloudy.

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 changed to an astronomical presentation.

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 August 13, 2016 Public Observing Night Sky


The Sun sets at 8:06 p.m. and is located in the constellation Leo the Lion.


The evening sky finds the Moon in the west southwest in the constellation Sagittarius and is at phase 80.14% lit at 10:00 pm.. The Moon sets at 1:47 a.m. The Moon is only 0046'47" degrees (less than 1/2 degree) from M-23 star cluster. See: Moon Map. See: How to find degrees.


Mars is visible in the south after sunset located in the constellation Scorpius. Mars photo below shows it's features facing Earth this night at 10:00 p.m. on August 13th.


Jupiter is located very low in the west this night located in the constellation Virgo. Jupiter sets at 9:31 p.m. When you look at Jupiter your seeing the planet as it appeared 49 minutes ago due to the 546,466,000 million miles it takes light traveling at 186,000 miles per second to reach your eyes from Jupiter. 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's moon below as seen at 8:30 p.m. on August 13th. 


 Information Update For August Coming Soon Below 

Our telescopes will show you the beautiful rings of Saturn. Saturn the ringed planet  is located in the south in the constellation Ophiuchus. Saturn appears as a pale yellow glow compared to the color of the background of stars. Image below shows the tilt of Saturn's rings this night..


Image below shows the location of some of Saturn's icy moons at 10:00 pm on public observing night. Titan, Saturn's largest moon is 5,150 km diameter, it is the second largest moon in the Solar System. Titans should be visible at magnitude is 9.6 this night.



Rising in the east early evening are the constellations Lyra with the famous ring nebulae M- 57, Ophiuchus, Libra and in the constellation Hercules with the beautiful globular cluster of stars containing hundreds of thousands of stars known as M13. The Summer Triangle consisting of the constellations Lyra with its bright star Vega, Cygnus with its bright star Deneb and Aquila with bright star Altair make up the triangle visible rising in the east. 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. Lower in the western sky is the constellation Leo the Lion and below Leo is the constellation Cancer and just above the horizon is the setting constellation Gemini the Twins. In the north is the Big Dipper to the left of the Little Dipper which contains 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 August 13, 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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