Chapter S1, Problem 53EAP

   $HA=LST-RA$

1. It is 4 p.m. on the March equinox. What is the local sidereal time?
2. The local sidereal time is 19:30. When will Vega cross your meridian?
3. You observe a star that has an hour angle of 13 hours  $\left({13}^h\right)$when the local sidereal time is 8:15. What is the star’s right ascension?
4. The Orion Nebula has declination of about  $-{5.5}^{\circ }$ and right ascension of  ${\text{5}}^{\text{h}}{\text{25}}^{\text{m}}$ . If you are at latitude ${40}^{\circ }\text{N}$ and the local sidereal time is 7:00, approximately where does the Orion Nebula appear in your sky?