declination axis การใช้

The ocular opening is on the side of the device in the declination axis at viewing height.
Nothing can be done if the optical tube is not perpendicular to the declination axis or if the R . A . and Dec axes are not perpendicular, because these problems are next to impossible to fix.
Mounts may also have a variable declination control to allow them to point at geosynchronous satellites in inclined orbits since those satellites have a constantly changing declination . ( Adding such a declination axis to a polar mount results in an equatorial mount ).
Adding further optics to a Nasmyth-style telescope to deliver the light ( usually through the declination axis ) to a fixed focus point that does not move as the telescope is reoriented gives a "'coud?"'focus ( from the French word for elbow ).
:: : This is very common for all except the smallest and cheapest telescopes, and is called an equatorial mount-for a simple version, all you need to do is set one of these up with the right ascension ( also called polar ) axis pointing at the celestial north pole, lock the declination axis, and rotate the polar axis so that it makes one revolution every 24 hours.