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Free Public Observing October 14, 2017

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

At John Rudy Park, York, PA. Observatory

There will be an Astronomy Program in the Observatory 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 717 759 YCAS (9227) 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 in observatory.

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

Public Observing Night Sky October 14, 2017 to be updated soon below.


The Sun on September 9, 2017 is in the constellation Leo "Leo the Lion"  setting at 7:25 pm.


Click on Moon to enlarge image.

The evening sky September 9th finds the Moon rising at 9:40 pm in the east located in the constellation Cetus "The Whale". Phase of the Moon on September 9, 2017: will be 83.38% of the Moon's visible disk illuminated. Full Moon known as the Full Corn Moon or Full Harvest Moon occurred on September 6th.

Planets Visible


Jupiter is located low in the west southwest about 8 degrees above the horizon in the constellation Virgo "The Maiden". Four of Jupiter's Moons are visible this night. Jupiter sets at 8:54 pm. Jupiter is easily visible soon after sunset being the brightest object. Jupiter is about 3 degrees right of Virgo's bright star Spica.


Saturn is in the south southwest this night located in the constellation Ophiuchus. Saturn sets at 12:56 am.


Neptune is in the constellation Aquarius and is up after sunset visible in the east southeast. Neptune sets around 6:37 am.


Uranus is located in Pisces and rises at 8:57 pm. It will be about 9 degrees above and slightly right of the Moon.

Constellations for 9:00 P.M.

 The Big Dipper is visible low in the northwest horizon. Upper right of the Big Dipper is 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. If you follow the curved handle of the Big Dipper it leads to the bright star Arcturus in the constellation Bootes "the Herdsman" high in the west northwest. Hercules "the Son of Jupiter" is high above Bootes in the west. Hercules contains the beautiful globular star cluster M-13. To the left and above of Hercules is the constellation Lyra "the Harp" near the meridian which contains the bright star Vega. Also in the constellation Lyra is M-57 "The Smoke Ring", the remnants of an exploding star is found in Lyra. Setting about an hour after after sunset low on the western horizon is Virgo "The Maiden" where due to so many distant galaxies are located is known as The Realm of Galaxies" Virgo contains the bright star Spica. To the right of Spica (about 6 degrees) is Jupiter the largest planet in our solar system. Looking towards the center of our galaxy "the Milky Way in the south to southeast are the constellations Scorpius "the Scorpion" with its red super giant star Antares and to the left of Scorpius is Sagittarius "the Archer" where Pluto is located. Rising in the east are the constellations Andromeda 'the Princess of Ethiopia containing M-31 (the Andromeda Spiral) galaxy and Pegasus "the Winged Horse". Rising in the east is the constellation Perseus "the Rescuer of Andromeda" These are just a few of the many constellations visible this night.

View the September 9, 2017, 2017  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.

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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