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Free Public Observing November 11, 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


The Sun on November 11, 2017 is in the constellation Libra "The Scales" rising at 12:54 pm.


Click on Moon to enlarge image.

November 11th finds the The Last Quarter Moon rising well after public observing ends rises at 12:44 am in the east located in the constellation Leo "The Lion" Phase of the Moon will be 46.05% of the Moon's visible disk illuminated. Full Moon known as the Full Beaver Moon or Full Harvest Moon occurred on November 4th.

Planets Visible for November Public Observing Night


Neptune is in the constellation Aquarius and is up after sunset visible in the south southwest. Neptune sets around 1:13 am.


Uranus is located in Pisces and rises at 4:54 am. It will be high in the south southeast.


Comet C/2017 O1 (ASASSN) is in the northern sky this night in constellation Camelopardalis. The comet will be an Angular separation: 1127'49.871" to the right (east) from Polaris.

Meteor Shower

The Leonid Meteor shower peaks on November 18th. 

Constellations for 9:00 P.M.

The Big Dipper is low in the northern horizon. Above 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. In the north is the Little Dipper, Cassiopeia "the Queen of Ethiopia" and Andromeda "the Princess of Ethiopia" containing M-31 (the Andromeda Spiral) galaxy. the constellation Pegasus "the Winged Horse". Perseus "the Rescuer of Andromeda". Rising in the east are the constellations Gemini "the Twins" and Orion "the Hunter". Above Orion is the constellation Taurus "the Bull". To the left (Northesast) of Taurus is the constellation Auriga :the Charioteer". The Summer Triangle consisting of the constellations Aquila, Lyra and Cygnus is low in the west. In the south you will find Aquarius "the Water Carrier" and Cetus "the Whale". These are just a few of the many constellations visible this night.


View the November 11, 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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