declination diagram

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• Magnetic declination — Example of magnetic declination showing a compass needle with a positive (or easterly ) variation from geographic north. Magnetic declination is the angle between magnetic north (the direction the north end of a compass needle points) and true… …   Wikipedia

• Lunar standstill — At a major lunar standstill, which takes place every 18.6 years, the range of the declination of the Moon reaches a maximum. As a result, at high latitudes, the Moon appears to move in just two weeks from high in the sky to low on the horizon.… …   Wikipedia

• Aberration of light — Light from location 1 will appear to be coming from location 2 for a moving telescope due to the finite speed of light, a phenomenon known as the aberration of light. The aberration of light (also referred to as astronomical aberration or stellar …   Wikipedia

• Compass — This article is about the direction finding instrument used in navigation. For other uses, see Compass (disambiguation). A simple dry magnetic pocket compass …   Wikipedia

• Proper motion — The proper motion of a star is its angular change in position over time as seen from the center of mass of the solar system.[1] It is measured in seconds of arc per year, arcsec/yr, where 3600 arcseconds equal one degree.[2] This contrasts with… …   Wikipedia

• Solstice — For other uses, see Solstice (disambiguation). UTC date and time of solstices and equinoxes[1] year Equinox Mar Solstice June Equinox Sept Solstice Dec day time day time day time day time 2004 20 …   Wikipedia

• Ceres (dwarf planet) — For other uses of the name Ceres , see Ceres. Ceres   Ceres as seen by Hubble Space Telescope (ACS). The …   Wikipedia

• Emery Molyneux — One of Molyneux s celestial globes, which is displayed in Middle Temple Library – from the frontispiece of the Hakluyt Society s 1889 reprint of A Learned Treatise of Globes, both Cœlestiall and Terrestriall, one of the English editions of Robert …   Wikipedia

• astronomical map — Introduction       any cartographic representation of the stars, galaxies, or surfaces of the planets and the Moon. Modern maps of this kind are based on a coordinate system analagous to geographic latitude and longitude. In most cases, modern… …   Universalium

• Intercept method — The Intercept Method , or Marcq St Hilaire method , as it is also rather inaccurately known, is an astronomical navigation method of calculating an observer s position on earth. It was originally called the azimuth intercept method because the… …   Wikipedia

• Earth's magnetic field — Computer simulation of the Earth s field in a normal period between reversals.[1] The tubes represent magnetic field lines, blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and… …   Wikipedia