Equinox: The Big Dipper Star Clock

The pointer stars Merak and Dubhe point at Polaris and go once around per sidereal day, every 23 hours 56 minutes and 4 seconds.  By making a daily correction it is possible to estimate the time at night using these three stars. One point on this is pretty much...

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Fundraising for Digital Planetariums

Planetarium technology isn’t the only thing that’s changed from the last heyday of planetarium installations in the '60s and '70s. 21st century fundraising is also a new concern for today’s educational planetariums. Today, a planetarium upgrade (or construction of a...

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