The apparent motion of the Sun revisited

Details The apparent motion of the Sun revisited The apparent motion of the Sun revisited

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ejph...23..315p&link_type=abstract

European Journal of Physics, Volume 23, Issue 3, pp. 315-322 (2002).

Physics

1

Scientific paper

The knowledge of the apparent motion of the Sun - due to the combined effects of the rotation of the Earth around its proper axis and the translation around the Sun - is important both in natural and man-made systems. In particular, a proper explanation of the seasons requires an understanding of this solar geometry. In this paper we present a simple derivation of the relevant formulae based on vector algebra. The possible trajectories are discussed in detail. An approximate explicit formula for the seasonal variations of solar radiation is derived and discussed. The calculations give useful insights into the geometry of the problem and are thought to be helpful for the undergraduate teaching of solar energy engineering, classical mechanics and astronomy.

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