Why are Equatorial mounts better for AP

Started Nov 22, 2012 | Questions thread
RustierOne Veteran Member • Posts: 4,312
Re: Why are Equatorial mounts better for AP

Hotphotons wrote:

Thanks to both of you for the explanation. Seems obvious now that I know.

Equatorial mounts are wonderful devices invented some centuries ago. If you could view an astronomer on Earth from some location in space, his telescope on an equatorial mount would appear to be stationary - pointed at a star. But the Earth would be rotating under his feet. So our goal with long exposure astrophotography is to have the telescope stationary and not rotating. From our perspective on the (rotating) Earth, the telescope is moving to keep up with the stars. But in reality, the stars and our telescope are really stationary. That's quite a revelation for many.

Best Regards,

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