Lab 2 Declination from Analemma PDF

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Harper College. GEG 112: Physical Geography Laboratory Finding the Sun’s Declination from an Analemma Description: an analemma is a chart that can be used to determine the declination of the sun on a given date. Basic Facts: • The declination of the sun refers to the latitude of the vertical rays of the sun on a given date. • Latitudes that experience the vertical rays of the sun are only in the tropics. That is, between the Tropic of Cancer and Tropic of Capricorn. Steps: 1. Find an analemma chart. This is available in the Course Materials for this Lab. 2. Find your date of interest on the graph. For example, September 10th. Northern Limit: Tropic of Cancer. June Solstice. 23.5°N

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September 10 on the chart

Southern Limit: Tropic of Capricorn. December Solstice. 23.5°S

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3. Read the corresponding latitude on the left-hand side scale on the chart. For September 10th the Declination of the Sun is 5°N (Very Important: You must in include a latitude indicator for the declination, N or S, since this a latitude value)

Declination of the Sun is 5°N

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