It is 3600 seconds for you have 60 minutes in every degree so there are 60 seconds in every minute.
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Latitude and longitude are angles, and are described in the same units as any other angular quantity. 60 seconds = 1 minute 60 minutes = 1 degree 360 degrees = 1 full circle
Every meridian of longitude is perpendicular to every parallel of latitude, and every parallel of latitude is perpendicular to every meridian of longitude.
Every degree of angle divides into 60 minutes of angle and every minute of angle divides into 60 seconds of angle. This system of measuring angles has been used since the Babylonians established it roughly 3000 years ago..
Every point on earth has both a latitude coordinate and a longitude coordinate. That's how you tell people where the point is, even if they're not there.
-- The place where a latitude intersects a longitude is a point, not a line. -- There are an infinite number of different longitudes, and each latitude intersects all of them. -- There are an infinite number of different latitudes, and each longitude intersects all of them. -- So you can see that there are a truly huge number of intersections. In fact, every point on Earth is an intersection of one latitude and one longitude, and no two points on Earth are the same intersection. On account of all that, there are no names.