In a scientific discussion, someone showed some data for navigation satellite with elevation angle E = -10 to +15 degree. I asked that E(min) = 5 deg. How come it be negative? The answer I got, ' for navigation satellite negative E is also acceptable'. I asked again what is the physical meaning of negative E. But I was neglected... Please help me out.. I really want to know...was I correct or not ?|||I was told a negative elevation angle of 10 degrees, means it is 10 degrees BELLOW your horizon.
Elevation angles are normally calculated relevant to the equator. This is because satellites have to orbit at a fixed height if they are to remain geostationary and this takes least energy at the equator due to the Earth's angular velocity being greatest there.
You might want to check out "inclined orbits" as well? They are similar, but relevant to the equator, rather than your horizon.
I hope this helps!|||hi...the possible answer to your question is...because the horizon is approx 11 miles standing at sea level, then, because of the curvature of the earth then the satellite elevation can/could be below the earths curvature which could aquate to the reading of -10 degrees.
therefore as stated...angle E = -10 to +15
10 deg below the curvature, and, 15 deg above the curvature.
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