Question:

How many degrees of longitude are there between 15 degrees east and 45 degrees east?

Answer:

There are 30 degrees in between those two points. Think of the Earth as a unit circle and the equator is at 0 degrees. AnswerParty!

More Info:

Earth Navigation Cartography Longitude Measurement Declination

Decimal degrees (DD) express latitude and longitude geographic coordinates as decimal fractions and are used in many geographic information systems (GIS), web mapping applications such as Google Maps, and GPS devices. Decimal degrees are an alternative to using degrees, minutes, and seconds (DMS). As with latitude and longitude, the values are bounded by ±90° and ±180° respectively.

Positive latitudes are north of the equator, negative latitudes are south of the equator. Positive longitudes are east of Prime Meridian, negative longitudes are west of the Prime Meridian. Latitude and longitude are usually expressed in that sequence, latitude before longitude.

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