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This 2 page Class Notes was uploaded by Visakha Sharma on Sunday February 28, 2016. The Class Notes belongs to ASTR-161 at a university taught by Christian J. Ready in Spring 2016. Since its upload, it has received 15 views.
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Date Created: 02/28/16
Ch2.2 Earth Spins on its Axis Earth rotates at the speed of 1,674km/h Earth rotates in counter clock direction, completing one rotation within 24 hrs. Apparent daily motion Occurs when the earth’s surface, the celestial body and across at the sky. Celestial sphere an imaginary concept made by astronomers, which helps visualize. North Celestial pole (NCP) Located directly at North Pole. 90 degrees away from celestial equator. South Celestial pole (SCP) Located directly at South Pole. Celestial Equator – Located exactly on the Earth’s equator. Latitude Measures the distance of north or south from the equator. Longitude Measures the distance at Greenwich, England, in the direction of east or west. Meridian is an imaginary line that splits the sky into east half and west half. Zenith a line that runs from north point to a south point. Nadir – points directly down towards you. Ecliptic is the path that sun takes besides the celest sphere. Circumpolar – means around the pole, always visible region at the sky. 2.3 Earths average distance from the sun is 1.50×10^8km (known as astronomical unit(AU))\ Ecliptic plane When sun would lie on the celestial equator. Vernal equinox located at the constellation Pisces, occurs during March 20. Equinox equally night everywhere on earth. Means night, day are at the same length. 2.4 New Moon rises at the direction of east, sunrise crosses the meridian near moon, and sets in west. Crescent means to grow. Waxing means to grow in size and brilliance. First quarter Moon occurs at noon, cycle from a new moon to new moon. Gibbous bright side of the moon. Waning becomes smaller. Third quarter occurs when you see half sunlit on the moon and half of the night side. Sidereal period when moon completes one revolution in 27.32 days. 2.5 Gregorian Calendar is a civil calendar which is based on tropical year. Solar day24hrs earth’s rotation which brings the sun back to the same location. Sidereal day the time it takes the earth to make that one rotation. Eclipse is a partial obscuration of one celestial body.
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