Net base copy

Caption; Earth's polar grid of  latitude parallels and longitude meridians is based on Earth's equator and poles.  Find the Takoma Park/Silver Spring campus of Montgomery College on the globe at 38 degrees 58 arc minutes =38.96666666667 degrees North Latitude and 77 degrees=5 arc hours and 8 arc minutes West Longitude! There are 60 arc minutes in a degree so 38 degrees 58 arc minutes is almost 39 degrees.   The historically important Gaithersburg transit telescope observatory just north of Gaithersburg High School is at 39 degrees and 2 arc minutes North Latitude.  77 degrees West Lontitude is the same as 5 hours and 8 minutes in rotation time.  360 degrees on longitude is equal to 24 hours of time in rotation.  Can you see how this is true?  15 degrees/hour, 1 degree/4 minutes.
Written by Dr. Harold Alden Williams.              

                                                                  sources:   www.montgomerycollege.edu/Departments/planet/M_AS102/coordinates/LatitudeLongitudeEarth.html