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Aphelion - the point in an orbit that is farthest from the sun. Perihelion - the point in an orbit that is closest to the sun. Sun - the star in our Solar System. Planet - a large celestial body that orbits a star.
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www.enchantedlearning.com/subjects/astronomy/activities...
www.enchantedlearning.com/subjects/astronomy/activities/label/aphelion/
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Mercury (planet) - Wikipedia, the free encyclopedia
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Mercury is the innermost and smallest planet in the Solar System, orbiting the Sun once every 87.969 days. The orbit of Mercury has the highest eccentricity of all the Solar System planets, and it ha...
en.wikipedia.org/wiki/Mercury_(planet)
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When the Earth is closer to the Sun, such as at perihelion, it will travel faster in it's orbit. In the diagram at perihelion, the Earth has travelled the arc of the arrow in the time it takes to rotate 360 degrees around it's axis and must still revolve through angle b to complete the apparent solar day.
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When Does Perihelion Occur ... What Was the Date the Last Time Earth Was at Perihelion ... Diagram of Perihelion...
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dictionary.reference.com/illustration.html/ahd4/perihel...
dictionary.reference.com/illustration.html/ahd4/perihelion/perihe
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We say therefore that the perihelion -- the point on its orbit when Mercury is closest to the Sun -- advances. ... In the diagram shown here, the amount of the advance is greatly exaggerated. The actual advance is only 43 seconds of arc per century.
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www.astro.cornell.edu/academics/courses/astro2201/merc_...
www.astro.cornell.edu/academics/courses/astro2201/merc_adv.htm
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Diagram showing the relative position of the Earth and Mars at various oppositions from 1995 to 2012, and the near-perihelion oppositions of 2018 and 2020 (with lines between the planets in black for past oppositions, and in red for future ones).
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cseligman.com/text/planets/marsoppositions.htm
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That the diagrams of figures 2a,b can produce as large a perihelion shift as the diagram of figure 1 is again a consequence of the ...
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www.springerlink.com/index/GR1066X147579436.pdf
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The first problem is the precession of the perihelion of Mercury. Einstein told us this was caused by extra curvature from the Sun, ... As you can see from the diagram, the light is not curving. Only his measurement of it is. Since the observer is only on one position on the Earth, the bending uses only half the field.
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milesmathis.com/easy.html
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There are a number of orbital parameters shown in the diagram: perihelion (closest distance to the sun), aphelion (farthest distance to the sun), semi-major axis (average distance to sun), and eccentricity. Note also the mathematical relationship between the variables.
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www.themcclungs.net/astronomy/people/kepler.html
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