iOptron 8401 manual

TIP:

Don’t be intimidated by the geometry. Hands-on experience will help you understand the concepts better.

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Since the celestial sphere completes a full rotation in 24 hours, it follows that: 24 h = 360°, 1 h = 15°, 1 min = 15’, and 1 sec = 15”. The declination (δ, DEC, or D) is measured along the hour circle (perpendicular to the equator, passing through the celestial poles) passing through the star from the point it intersects the equator, it is in degrees. The right ascension (α, RA or R) is measured on the equator from the gamma point in the direction opposite to the direction of the motion of the star. It is in hours, minutes and seconds. Gamma point is the intersection of the hour circle and the celestial equator.

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