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Latest revision Your text
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=== Ecliptic coordinates ===

=== Ecliptic coordinates ===

These equations, from the ''[[Astronomical Almanac]]'',<ref>

These equations, from the ''[[Astronomical Almanac]]'',<ref>

{{cite book

{{cite book |author=U.S. Naval Observatory |url=https://archive.org/details/astronomicalalma0000unse_n8r6 |title=The Astronomical Almanac for the Year 2010 |author2=U.K. Hydrographic Office, H.M. Nautical Almanac Office |date=2008 |publisher=U.S. Govt. Printing Office |isbn=978-0-7077-4082-9 |page=C5}}</ref><ref>

| author = U.S. Naval Observatory

| author2 = U.K. Hydrographic Office, H.M. Nautical Almanac Office

| title = The Astronomical Almanac for the Year 2010

| publisher = U.S. Govt. Printing Office

| date = 2008

| isbn = 978-0-7077-4082-9

|page=C5}}</ref><ref>

Much the same set of equations, covering the years 1800 to 2200, can be found at [http://aa.usno.navy.mil/faq/docs/SunApprox.php Approximate Solar Coordinates], at the [http://www.usno.navy.mil/USNO U.S. Naval Observatory website] {{webarchive|url=https://web.archive.org/web/20160131231447/http://www.usno.navy.mil/USNO |date=2016-01-31 }}. Graphs of the error of these equations, compared to an accurate [[ephemeris]], can also be viewed.</ref>

Much the same set of equations, covering the years 1800 to 2200, can be found at [http://aa.usno.navy.mil/faq/docs/SunApprox.php Approximate Solar Coordinates], at the [http://www.usno.navy.mil/USNO U.S. Naval Observatory website] {{webarchive|url=https://web.archive.org/web/20160131231447/http://www.usno.navy.mil/USNO |date=2016-01-31 }}. Graphs of the error of these equations, compared to an accurate [[ephemeris]], can also be viewed.</ref>

can be used to calculate the apparent coordinates of the [[Sun]], [[Epoch (astronomy)|mean equinox and ecliptic of date]], to a precision of about 0°.01 (36″), for dates between 1950 and 2050. Similar equations are coded into a [[Fortran]] 90 routine in Ref.<ref name="Zhangetal">Zhang, T., Stackhouse, P.W., Macpherson, B., and Mikovitz, J.C., 2021. A solar azimuth formula that renders circumstantial treatment unnecessary without compromising mathematical rigor: Mathematical setup, application and extension of a formula based on the subsolar point and atan2 function. ''Renewable Energy'', 172, 1333-1340. DOI: https://doi.org/10.1016/j.renene.2021.03.047</ref> and are used to calculate the [[solar zenith angle]] and [[solar azimuth angle]] as observed from the surface of the Earth.

can be used to calculate the apparent coordinates of the [[Sun]], [[Epoch (astronomy)|mean equinox and ecliptic of date]], to a precision of about 0°.01 (36″), for dates between 1950 and 2050. Similar equations are coded into a [[Fortran]] 90 routine in Ref.<ref name="Zhangetal">Zhang, T., Stackhouse, P.W., Macpherson, B., and Mikovitz, J.C., 2021. A solar azimuth formula that renders circumstantial treatment unnecessary without compromising mathematical rigor: Mathematical setup, application and extension of a formula based on the subsolar point and atan2 function. ''Renewable Energy'', 172, 1333-1340. DOI: https://doi.org/10.1016/j.renene.2021.03.047</ref> and are used to calculate the [[solar zenith angle]] and [[solar azimuth angle]] as observed from the surface of the Earth.

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:<math> Z = R \sin \epsilon \sin \lambda </math>

:<math> Z = R \sin \epsilon \sin \lambda </math>

:Where <math>X</math> axis is in the direction of the [[Equinox#Celestial coordinate systems|March equinox]], the <math>Y</math> axis towards [[June solstice|June Solstice]], and the <math>Z</math> axis towards the [[Celestial pole|North celestial pole]].<ref>

:Where <math>X</math> axis is in the direction of the [[Equinox#Celestial coordinate systems|March equinox]], the <math>Y</math> axis towards [[June solstice|June Solstice]], and the <math>Z</math> axis towards the [[Celestial pole|North celestial pole]].<ref>

{{cite book |author=U.S. Naval Observatory Nautical Almanac Office |url=https://archive.org/details/explanatorysuppl00pken/page/12 |title=Explanatory Supplement to the Astronomical Almanac |date=1992 |publisher=University Science Books, Mill Valley, CA |isbn=0-935702-68-7 |editor=P. Kenneth Seidelmann |page=12}}</ref>

{{cite book|author=U.S. Naval Observatory Nautical Almanac Office|title=Explanatory Supplement to the Astronomical Almanac|date=1992|publisher=University Science Books, Mill Valley, CA|isbn=0-935702-68-7|editor=P. Kenneth Seidelmann|page=12}}</ref>



=== Horizontal coordinates ===

=== Horizontal coordinates ===

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Greek: Ά ά Έ έ Ή ή Ί ί Ό ό Ύ ύ Ώ ώ   Α α Β β Γ γ Δ δ   Ε ε Ζ ζ Η η Θ θ   Ι ι Κ κ Λ λ Μ μ   Ν ν Ξ ξ Ο ο Π π   Ρ ρ Σ σ ς Τ τ Υ υ   Φ φ Χ χ Ψ ψ Ω ω   {{Polytonic|}}
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