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The apoapsis
- The mountain represents the highest point in the orbit. That's called the apoapsis.
science.nasa.gov/learn/basics-of-space-flight/chapter3-4/
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The position of the Sun in the sky is a function of both the time and the geographic location of observation on Earth's surface. As Earth orbits the Sun over the course of a year, the Sun appears to move with respect to the fixed stars on the celestial sphere, along a circular path called the ecliptic.
Its spin has a tilt of 7.25 degrees with respect to the plane of the planets’ orbits. Since the Sun is not solid, different parts rotate at different rates. At the equator, the Sun spins around once about every 25 Earth days, but at its poles, the Sun rotates once on its axis every 36 Earth days.
May 2, 2024 · The point of nearest approach of the planet to the Sun is called perihelion. The point of greatest separation is aphelion, hence by Kepler's second law, a planet is moving fastest when it is at perihelion and slowest at aphelion.
The zenith (UK: / ˈzɛnɪθ /, US: / ˈziːnɪθ /) [1] is the imaginary point on the celestial sphere directly "above" a particular location. "Above" means in the vertical direction (plumb line) opposite to the gravity direction at that location (nadir). The zenith is the "highest" point on the celestial sphere.
The orbit of a planet around the Sun is an ellipse, with the Sun in one of the focal points of that ellipse. [This focal point is actually the barycenter of the Sun-planet system ; for simplicity, this explanation assumes the Sun's mass is infinitely larger than that planet's.]
Jun 13, 2024 · Animated depiction of Earth (the blue ball) orbiting the sun (the yellow ball), showing the projection of Earth-sun plane – the ecliptic – onto the background stars.
Jul 29, 2023 · The orbital speed of a planet traveling around the Sun (the circular object inside the ellipse) varies in such a way that in equal intervals of time (t), a line between the Sun and a planet sweeps out equal areas (A and B).
