King Rate

King Rate

King Rate
abstracted from Manual of Celestial Photography by Edward S. King ©1955

King's formula, in terms of the rotation period of the hour axle in universal minutes is, when the hour axis is aligned on the refracted pole:

There is a sensible diference in the drive rate for the hour axis aligned on the true pole:

Gamma is the elevation of the hour axis above the true pole. At the refracted pole:

At the true pole: hence

therefore: mean minutes per revolution of the hour axle.

as in

where n is the RA worm ratio.

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