In a place whose latitude is –45o (S), a star was observed at an altitude of 45o and in an azimuth of 100o east.

In a place whose latitude is –45o (S), a star was observed at an altitude of 45o and in an azimuth of 100o east. Find the hour angle and declination of this star.

If the latitude is south, then the south pole of the world will be visible above the horizon, and the north pole will be below the horizon. To build in this case the celestial sphere, you need to postpone the height of the north pole of the world (latitude of the place) under the horizon from the north point (N). The position of the points of the horizon does not change, and the direction of rotation of the celestial sphere also does not change – it always occurs clockwise, if you look at the celestial equator from the north pole of the world.
From the figure we find: hour angle a = NEWQR = 320o and declination b = NRM = –20o.

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