Constellation – Sky Familiarization

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Presentation transcript:

Constellation – Sky Familiarization

Objectives Learn sky navigation using the SC-1 Star Chart Locate the meridian, horizons, and zenith for a given date and time. Use the star chart to locate stars and constellations in the night sky.

Nacogdoches View East Zenith 32o CE NCP 32o South North SCP West Horizon East Sketch the celestial sphere. Include the CE, NSP, SCP, zenith, meridian, nadair, horizon, due east and west points .

The stars visible, at any given time, continuously changes The stars visible, at any given time, continuously changes. This a result of the Earth’s motion, rotation and revolution.

Declination (degrees) Right Ascension (hours) North Ecliptic Sun’s Path East Celestial Equator Declination (degrees) Right Ascension (hours) South

Find the position of the star Sirius North East RA = 6h 45m DEC = -17d South

March 22 @ 8:00 p.m North Zenith East West Point South Meridian

March 22 @ 8:00 p.m East Point

March 22 @ 8:00 p.m North Zenith East West Point South Meridian

March 22 @ 9:00 p.m Zenith West Point Meridian West Horizon North East South Meridian West Horizon

March 22 @ 10:00 p.m Zenith West Point Meridian West Horizon North East West Point South Meridian West Horizon

January 10 @ 8:00 p.m North East 5 days X 4 min/day=20 min

Sky Familiarization A Few Things to Remember The NCP is located above the north point on the horizon. The angular distance is equal to your latitude. The zenith is located an angular distance equal to your latitude from the CE, i.e., the declination of the zenith is your latitude. Any vertical line on your SC-1 (north-south) is a meridian. Approximately one half of the stars on the SC-1 are visible at any given time (12 hours of RA).