Editing Equatorial coordinate system (section)

===Declination===
{{Main|Declination}}

The declination symbol {{math|''δ''}}, (lower case "delta", abbreviated DEC) measures the angular distance of an object perpendicular to the celestial equator, positive to the north, negative to the south. For example, the north celestial pole has a declination of +90°. The origin for declination is the celestial equator, which is the projection of the Earth's equator onto the celestial sphere.  Declination is analogous to terrestrial [[latitude]].<ref name="calculator28">
{{cite book
 | title=Practical Astronomy with Your Calculator, third edition
 | author=Peter Duffett-Smith
 | year=1988
 | publisher=[[Cambridge University Press]]
 | isbn=0-521-35699-7
 | pages=[https://archive.org/details/practicalastrono0000duff/page/28 28–29]
 | url=https://archive.org/details/practicalastrono0000duff/page/28
 }}</ref><ref name="simple">
{{cite book
 | title=Astronomy Made Simple
 | url=https://archive.org/details/astronomymadesim00hamb
 | url-access=registration
 | author=Meir H. Degani
 | isbn=0-385-08854-X
 | date=1976
 | publisher=Doubleday & Company, Inc
 | page=[https://archive.org/details/astronomymadesim00hamb/page/216 216]
}}</ref><ref>
''Astronomical Almanac 2010'', p. M4
</ref>