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When using Polaris as a polar alignment reference,
atmospheric refraction effects may need to be factored
in, particularly at low latitudes. The charts below
shows the refraction correction at sea level for various
latitudes. The correction should be subtracted from the
apparent elevation of the celestial pole (via
observations of Polaris) to obtain the true elevation of
the celestial pole. Maximum refraction at 0°
(equator) is ~34-1/2 minutes.
Refraction at high latitudes.
Copyright 2001 by David A. Kodama