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Free Public Observing Night To Be Announced

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 2015 Night Sky for Public Observing.

Below To Be Updated Soon For 2015

Watch The Geminids Meteor Shower

Catch a falling star

This night the Geminids meteor shower peaks on the night of December 13/14th, when meteor rates can be 60-120 meteors per hour are possible. See Tonight's sky under Meteors for map of where to look. This is one of the best meteor showers of the year and never seems to disappoint observers. These meteors appear to radiate from the constellation Gemini the Twins, the radiant point is about 1 degree from the bright star Castor of the Gemini constellation. Weather permitting, join YCAS astronomers and catch a falling star!


The Sun sets at  4:42 p.m. The Sun is in the constellation Ophiuchus.


The Moon this night rises at 11:43. It is in the constellation Leo the Lion as it rises.

Planets Visible for Public Observing evening sky


Mars sets at 8:08 p.m. as public observing begins. It is in the constellation Capricornus low in the west southwest.


Neptune is visible in the west located in the constellation Aquarius the Water Carrier, setting at 10:32 p.m..


Uranus is high in the southern sky about 37 degrees above Neptune located in the constellation Pisces the Fish.


The winter constellations are rising in the eastern evening sky, the autumnal constellations are overhead, and summer constellation are all but gone from the sky. 

Lingering low in the northwestern sky is the asterism known as the Summer Triangle with its stars Vega, Deneb, and Altair which form the distinctive triangle. Overhead this night you can see the constellation Andromeda, lower in the west is Pegasus, rising higher in the east is Taurus the Bull, Gemini and Orion are also rising in the east. In the northern sky are the constellations Cassiopeia, Ursa Major (Big Dipper) and Ursa Minor (Little Dipper) with the north star Polaris just to mention a few of these wonderful constellations the ancients knew so well. It takes light from Polaris 390 light years to reach us.

View the December 13, 2014  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. 


2014 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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