Earth Orbits

Earth Orbit Velocity

地球轨道速度

The velocity of a satellite in circular orbit around the Earth depends upon the radius of the orbit and the acceleration of gravity at the orbit.

卫星绕地球做圆周运动时，其速度取决于轨道半径和轨道处的重力加速度。

h = m = x 10⁶ m, r = x 地球半径, g = m/s² = x 地球表面重力加速度。v = m/s= km/h= mi/h。

中文译文中的待填/计算数值依次对应：1：h 2：h6 3：rr 4：gp 5：gr 6：vo 7：vok 8：vom。实际数值以上方原输入框为准。

Syncom Satellites

Syncom 卫星

Communication satellites are most valuable when they stay above the same point on the earth, in what are called "geostationary orbits". This occurs when the orbital period is 24 hours. From an orbit velocity calculation, it can be seen that a satellite at a radius 6.62 times the Earth's radius will have a period of 24 hours. These satellites are some 35,900 kilometers or about 22,300 miles above the Earth's surface.

通信卫星在地球上方同一位置保持静止时最为有价值，这种轨道被称为“地球同步轨道”。当轨道周期为24小时时会发生这种情况。从轨道速度计算可以看出，距离地球半径6.62倍的卫星将具有24小时的周期。这些卫星距离地球表面约35,900公里，或约22,300英里。

The minimum transit time to a syncom satellite and back from the surface of the Earth is about a quarter of a second. Any kind of electromagnetic wave travels at the speed of light. So in satellite-linked communication, there will be a minimum of a quarter of a second delay.

从地球表面到同步卫星并返回的最小传输时间约为四分之一秒。任何类型的电磁波都以光速传播。因此，在卫星通信中，会有至少四分之一秒的延迟。