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Free Public Observing Night August 8, 2015

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 .



If you arrive at 8:00 p.m. you may catch a glimpse of the sun through YCAS solar telescope just before the sun sets. The Sun June 13th is in the constellation Taurus the Bull, the Sun sets at 8:37 p.m.


The Moon on June 13th is not visible for public observing rising at 3:35 a.m. in the morning, it is located in the constellation Aries.

Planets Visible for Public Observing evening sky

Venus shines brightly about 10 degrees below Jupiter in the constellation Cancer in the west setting around 11:38 p.m. Venus appears only 0055'12" from M-44 the Beehive open star cluster. 'Venus shows a disk with a phase of 45.48% lit.

Note: The planets Venus and Jupiter will converge over the course of the next few weeks, spending a week less than a degree apart from each other after a spectacular close conjunction on the evening of June 30th when the two planet appear only 20 arcminutes and 37 arcseconds of a degree apart!

 Jupiter is  in the west about 10 degrees above Venus. Jupiter is in the constellation Leo the Lion setting around midnight. Four of Jupiter's Moons are visible as public observing begins. Ganymede and Callisto will appear close together at a separation of 9" arcseconds apart at 8:30 at 9:00 a 10" separation. In comparison the disk of Jupiter is 33" arcseconds across. See below image of Jupiter's Moons at 9:00 p.m...

Saturn is visible low in the southeast evening sky in the constellation Libra the Scales just above Scorpius the scorpion. Check out Saturn's rings!


2014 Q2 Lovejoy appears as a faint fuzzy star around 8.8 magnitude that is located in the constellation Ursa Minor (The Little Dipper) about 8 degrees from Polaris the pole star. For those of you who wish to look for this comet with goto telescopes, at 9:00 p.m. go to RA: 14h 49m 26.359s Dec: +8227'13.629". At 9:30, RA: 14h 47m 28s Dec: +8224'20".


The spring-summer constellations are now visible rising in the June evening sky as twilight falls. Gemini is low in the west. Leo the Lion is visible above Gemini. High overhead is the constellations Bootes and below Bootes is Virgo, Libra rising behind them. Also in the east is Hercules, Cygnus, Lyra and just rising in the south is the summer constellation of Scorpius and Aquila. The Big Dipper is high in the northwest sky as evening twilight ends. Using the Big Dipper to find north. See: Finding North Star.

View the June 13, 2015  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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