Basics » Geographic Position » Exercises
What is the Geographic Position (lon, lat) of Star A?
The correct answer is b.
The GP of Star A is 70 degrees W, 45 degrees N. A star's geographic position (GP) = its (west longitude, latitude) = its (GHA, Declination). Note that the order of these coordinates is reversed from the typical (latitude, longitude) values denoting cities, landmarks, or other locations on Earth.
Identify the position (GHA, Dec) of each celestial object shown in the image.
Star B GHA Dec
Star C GHA Dec
Star D GHA Dec
Star B GHA: 90° Dec: 15°N
Star C GHA: 40° Dec: 12°S
Star D GHA: 20° Dec: 30°N
Note that because GHA is measured westward from 0 to 360 degrees, the abbreviation "W" to specify direction is not included.