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from article Earth rotation and orbital motion
Excess length of day [length of day − 86,400 atomic Système International (SI) seconds], measured in milliseconds.
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from article Earth rotation and orbital motion
Couple produced by tidal friction.
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from article Earth rotation and orbital motion
Schematic representation of the Earth's orbit.
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from article Earth rotation and orbital motion
Equation of time.
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from article Earth rotation and orbital motion
Precession/nutation and polar motion.
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from article Solar neutrino
A composite of 25 separate images taken by NASA’s Solar Dynamics Observatory (SDO) between February 2013 and February 2014. The composite images indicate regions in the Sun’s mid-latitudes where the body is most actively erupting with solar flares.…
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from article Sloan Digital Sky Survey
Sloan Digital Sky Survey (SDSS) 2.5-m (98-in.) telescope at Apache Point Observatory, New Mexico. The secondary mirror is visible in the center of the aperture. The square structure surrounding the primary and secondary mirrors shelters them from…
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from article Sloan Digital Sky Survey
Spectrum of a galaxy (image inset) receding at around 6000 km s−1 (3700 mi s−1), or about 2% of the speed of light. The vertical line shows the wavelength at which one expects to observe the emission line Hα for an object at rest (656.3 nm). The…
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from article Sloan Digital Sky Survey
Distribution of galaxies within 4° of the celestial equator from the SDSS. In this polar plot, the radius indicates the distance from the Milky Way, and the angle is the right ascension. The diameter shown is 8 × 109 light-years. Blank areas have…
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from article Sloan Digital Sky Survey
Map of stars in the SDSS. Grayscale signifies density of stars on the sky. Several streams of stars are noticeable. Areas in background are those unobserved by the survey. (Courtesy of Vasily Belokurov; Sloan Digital Sky Survey)
