Black Hills Astronomical Society's
Hidden Valley Observatory


The dates of our public Friday Night Star Parties, and our regular meetings, are available: Click here for schedule information

Friday nights that are too close to the full moon are avoided.   Please note that star parties are held "weather permitting". Click on this link for weather information: "Clear Sky Clock"
A star party is cancelled if the weather is rainy or cloudy. We usually begin each summer star party starting at about 9:00 P.M. 

We may be able to host a group for private viewing of the heavens using our facilities.  However, to arrange this please contact our observatory director (see "Questions?" below) up to 3 months, but not less than 2 months, in advance to reserve a date.

Our star parties for the public are a great way to learn about astronomy and see things for yourself.  In order that they be enjoyable for everyone, we ask that you familiarize yourself with star party etiquette (click here).

The Hidden Valley Observatory is located at 4715 Hidden Valley Rd., about 1/4 mile west of Sturgis Rd. (Hwy 79 north).

Click here for Map.

NEW ---> A table of times for sunrise, sunset, twilight, and lunar illumination for the observatory's location is available here.  An explanation of the items listed in the table is available here<--- Revised December, 2013!

Questions? ... Please contact Steve Parker (Observatory Director, Black Hills Astronomical Society's Hidden Valley Observatory) at 6 0 5 - 3 4 8 - 4 8 3 8 or by e-mail at    Steve is usually not available during the day, but leave a message on his answering machine and he'll get back to you.

Acknowledgement: Great appreciation is extended to the sisters of St. Martin Monastery for providing the land upon which the observatory is located through a one dollar, renewable ten year lease.

Questions/comments about this website?  Contact Website Editor George - (6 0 5) 3 4 8 - 0 3 4 9.

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