estimated
Estimated
If the horizon is on a level line of sight, a vertical line directly above the observer forms an angle of 90 degrees. 55 degrees would be quite high, being above 45 degrees.
According to Einstein's famous Theory of Relativity, the answer depends on the observer's frame of reference, and it can be different for different observers. If the observer is sitting on a hot soldering iron or standing on a campfire, then ten minutes appears to be many years long. If the observer's girl friend is sitting on his lap, then ten minutes appears to be shorter than the bit time on a multi- gigabit fiber trunk. Everything is relative to the individual observer. It could be stimated by an activity. for instance, If you want to hold your breath for ten minutes is long but if you are having fun doing something, ten minutes is a very short time.
ABOUT 2O FEET
Because the speed of light is the same for every observer, no matter how fast or in what direction he may be moving. Everything else in between is just algebra.
Estimated
Zenith
The zenith.
It's a research tool for measuring sedation subjectively.
astronomical telescope..
Zenith
Axial tilt.spherical shape
That's called the observer's "zenith".
a tubular optical instrument containing lenses and mirrors by which an observer obtains an otherwise obstructed field of view.
The point just overhead is called the zenith. The objects visible at that point depend on the date, the time of day or night, and the observer's location.
Two.
The azimuth originates at true NorthThe azimuth originates form the north point. It is a measure of how far an object is form the observer's north point.