All photos. One of the few supplements to hold up under research scrutiny, creatine has been shown to help lessen the pain and duration of muscle soreness from an intense strength-training session. Creatine is an amino acid whose job in your body is to funnel energy to your cells, particularly your muscle cells.
Perihelion, Aphelion and the Solstices. The Earth is closest to the Sun â at its Perihelion â about 2 weeks after the December Solstice and farthest from the Sun â at its Aphelion â about 2 weeks after the June Solstice. Earth's orbit around the Sun changes. Earth is farthest from the Sun on its orbit when it is summer in the Northern Hemisphere.
Two medium Earth orbits are notable: the semi-synchronous orbit and the Molniya orbit. The semi-synchronous orbit is a near-circular orbit (low eccentricity) 26,560 kilometers from the center of the Earth (about 20,200 kilometers above the surface). A satellite at this height takes 12 hours to complete an orbit.his special, high Earth orbit is called geosynchronous. A satellite in a circular geosynchronous orbit directly over the equator (eccentricity and inclination at zero) will have a geostationary orbit that does not move at all relative to the ground.