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2. Milankovitch cycles - Wikipedia

   en.wikipedia.org/wiki/Milankovitch_cycles

   For Earth's current orbital eccentricity, incoming solar radiation varies by about 6.8%, while the distance from the Sun currently varies by only 3.4% (5.1 million km or 3.2 million mi or 0.034 au). [11] Perihelion presently occurs around 3 January, while aphelion is around 4 July.

3. Earth - Wikipedia

   en.wikipedia.org/wiki/Earth

   Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.

4. Earth's orbit - Wikipedia

   en.wikipedia.org/wiki/Earth's_orbit

   Ignoring the influence of other Solar System bodies, Earth's orbit, also called Earth's revolution, is an ellipse with the Earth–Sun barycenter as one focus with a current eccentricity of 0.0167. Since this value is close to zero, the center of the orbit is relatively close to the center of the Sun (relative to the size of the orbit).

5. Apsis - Wikipedia

   en.wikipedia.org/wiki/Apsis

   The apsides refer to the farthest (2) and nearest (3) points reached by an orbiting planetary body (2 and 3) with respect to a primary, or host, body (1). An apsis (from Ancient Greek ἁψίς (hapsís) 'arch, vault'; pl. apsides / ˈ æ p s ɪ ˌ d iː z / AP-sih-deez) [1] [2] is the farthest or nearest point in the orbit of a planetary body about its primary body.

6. Apsidal precession - Wikipedia

   en.wikipedia.org/wiki/Apsidal_precession

   The ancient Greek astronomer Hipparchus noted the apsidal precession of the Moon's orbit (as the revolution of the Moon's apogee with a period of approximately 8.85 years); [4] it is corrected for in the Antikythera Mechanism (circa 80 BCE) (with the supposed value of 8.88 years per full cycle, correct to within 0.34% of current measurements). [5]

7. List of future astronomical events - Wikipedia

   en.wikipedia.org/wiki/List_of_future...

   Near-Earth asteroid (99942) Apophis will pass Earth at a relatively small distance of 31,200 km (19,400 mi) above Earth's surface, closer than some geosynchronous satellites. [5] 2029 June 26 Total lunar eclipse. With an umbral eclipse magnitude of 1.84362, it will be the largest total lunar eclipse of the 21st century. 2029 December 20

8. Orbit: Earth's Extraordinary Journey - Wikipedia

   en.wikipedia.org/wiki/Orbit:_Earth's...

   Orbit: Earth's Extraordinary Journey is a BBC documentary series presented by Kate Humble and Helen Czerski which aired in 2012. Running for three 60 minute episodes, the series focuses on Earth's orbit around the Sun and its effect on humans, the climate, and geological features.

9. Comet ISON - Wikipedia

   en.wikipedia.org/wiki/Comet_ISON

   ScienceCasts: Comet of the Century by Science@NASA at YouTube.com ; NASA's Deep Impact Spacecraft Images Comet ISON by JPL News at YouTube.com; Path of Comet ISON through the SOHO/LASCO fields of view by Bill Thompson at Sungrazing Comets; Time-lapse image of C/2012 S1 (ISON) and main-belt asteroid 4417 Lecar by Erik Bryssinck at Astronomie.be