solar declination

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• Solar Declination —   The apparent angle of the sun north or south of the eath s equatorial plane. The earth s rotation on its axis causes a daily change in the declination …   Energy terms

• Solar declination —   The apparent angle of the sun north or south of the earth s equatorial plane. The earth s rotation on its axis causes a daily change in the declination.   U.S. Dept. of Energy, Energy Information Administration s Energy Glossary …   Energy terms

• Declination — For other uses, see Declination (disambiguation). In astronomy, declination (abbrev. dec or δ) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. Declination in astronomy is… …   Wikipedia

• Solar System — This article is about the Sun and its planetary system. For other systems, see planetary system and star system. For a list of physical and orbital statistics for the Solar System s largest bodies, see List of gravitationally rounded objects of… …   Wikipedia

• Solar calendar — A solar calendar is a calendar whose dates indicate the position of the earth on its revolution around the sun (or equivalently the apparent position of the sun moving on the celestial sphere).Tropical solar calendarsIf the position of the earth… …   Wikipedia

• Solar azimuth angle — The solar azimuth angle is the azimuth angle of the sun. It is most often defined as the angle between the line from the observer to the sun projected on the ground and the line from the observer due south. A positive azimuth angle generally… …   Wikipedia

• Solar apex — The solar apex, or the Apex of the Sun s Way, refers to the direction that the Sun travels through space. This is not to be confused with the Sun s apparent motion through the constellations of the zodiac, which is illusory this supposed motion… …   Wikipedia

• Solar elevation angle — The solar elevation angle is the elevation angle of the sun. That is, the angle between the directionof the sun and the (idealized) horizon. It can be calculated, to a good approximation, using thefollowing formula::, sin heta mathrm{s} = cos h… …   Wikipedia

• declination —   the latitude where, on any particular day, the sun is 90˚ above the horizon at solar noon i.e. when the sun is aligned between true north and true south …   Geography glossary

• Declination —   The angular position of the sun at solar noon with respect to the plane of the equator …   Energy terms

• Sundial — A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating… …   Wikipedia