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Free Public Observing Night June 13, 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 2015 Night Sky for Public Observing.



The Sun June 13th is in the constellation Aries the Ram, the Sun sets at 8:09 p.m.


The Moon on May 9th is not visible for public observing rising around midnight, it is located in the constellation Sagittarius. Last Quarter Moon occurs on the 11th at 6:36 am Eastern Daylight Time.

Planets Visible for Public Observing evening sky

Mercury at magnitude +0.8 is visible just after sunset low on the horizon in the west northwest, setting at 9:58 p.m. Mercury is in the constellation Taurus the Bull. You need a clear flat horizon to view Mercury. Mercury below shows a disk with a phase of 29.66% lit.

Venus shines brightly in the constellation Gemini the Twins in the west setting around 11:45 p.m. Venus below shows a disk with a phase of 63.59% lit.

 Jupiter is high in the west southwest in the constellation Cancer the Crab setting around 2:12 a.m.. Three of Jupiter's Moons are visible as public observing begins then at about 9:13 p.m. a fourth Moon, Ganymede will reappear from eclipse of Jupiter. Check out some of Jupiter's Moons through a YCAS telescope. Below is view of Jupiter and Moons around 9:40 on public observing night. The four bright "Galilean" moons of Jupiter left to right, Europa  Io, Ganymede and Callisto. The "GRS" Great Red Spot is just starting to come into view.

Saturn is just starting to rise as public observing ends.


2014 Q2 Lovejoy is a faint Comet that is located in the constellation Cepheus about 8 degrees below Polaris the pole star. If you have a goto telescope you can use this ephemeris: 2014 Q2 Lovejoy.


The winter constellations are sinking low in the west soon to be lost from view as the spring constellations are now visible rising in the May evening sky as twilight falls. You can still see the bright star Sirius twinkling brightly low in the southwest in the constellation Canis Major right after sunset. Gemini is in the west. Leo the Lion is visible high overhead. Constellations Bootes and Virgo are in the south eastern sky with Libra rising behind them. The Big Dipper is high in the northern sky as evening twilight ends. This time of the year is a good time to look for the more elusive stars of the Little Dipper. Find the two stars that form the outer edge of the “bowl” of the Big Dipper, which stand almost vertically at around 9:30 pm. These two stars, Merak and Dubhe, are commonly called “The Pointers” since a line passing through them and extending toward the horizon point directly to Polaris, the North Star. Polaris marks the end of the “handle” of the Little Dipper. 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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