单项选择题
A.Altitude B.Zenith C.Declination D.Zenith distance
In the horizon system of coordinates what is equivalent...
单项选择题In the horizon system of coordinates what is equivalent to the equator on the Earth?（）.
A.Prime vertical circle B.Principal vertical circle C.Parallels of altitude D.Horizon
In order for a star to be used for a sight at lower tra...
单项选择题In order for a star to be used for a sight at lower transit，the star must（）.
A.be circumpolar B.have a declination equal to or greater than your latitude C.have a GHA of 180° D.have the SHA equal to or less than the LHA
In low latitudes，a first quarter Moon will always rise ...
单项选择题In low latitudes，a first quarter Moon will always rise at about（）.
A.sunrise B.1200 LMT C.sunset D.2400 LMT
