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In astrodynamics, canonical units are defined in terms of some important object’s orbit that serves as a reference. In this system, a reference mass, for example the Sun’s, is designated as 1 “canonical mass unit” and the mean distance from the orbiting object to the reference object is considered the “canonical distance unit”.
To do this around the Earth, it must be on a free trajectory which has an altitude at perigee (altitude at closest approach) around 80 kilometers (50 mi); this is the boundary of space as defined by NASA, the US Air Force and the FAA. To remain in orbit at this altitude requires an orbital speed of ~7.8 km/s.
A planar approximation for the surface of the Earth may be useful over very small distances. It approximates the arc length, , to the tunnel distance, , or omits the conversion between arc and chord lengths shown below. The shortest distance between two points in plane is a Cartesian straight line.
Earth's atmosphere photographed from the International Space Station.The orange and green line of airglow is at roughly the altitude of the Kármán line. [1]The Kármán line (or von Kármán line / v ɒ n ˈ k ɑːr m ɑː n /) [2] is a conventional definition of the edge of space.
The designation of a location as, for example [54.1855,-2.9857] means that it is potentially computer searchable and that it can be located by a generally (open) referencing system such as Google Earth or OpenStreetMap. The location [54.1855,-2.9857] is that of a 2023 piece of land art 'Out of the ground, a thread of air' by Julie Brook.
If you want to make your home smell good but don’t want to spend a lot, Target’s Threshold candles are an unbeatable value. This two-wick candle is just over 15 ounces and offers up to 50 ...
"He pulled me down the hall and said to me, 'I love you, I love you, and I'm so sorry. And I know you don't want me to do the movie,' " Grey has said. "And he got the tears in his eyes.
There was no room for Jesus at the inn, just like there’s no room for Him in some people’s lives today. And even during a season He’s meant to be the center of, some still don’t make room.