Position of the Sun by
for a day
Input (red frames):
1) date, month, year
Don't modify any other cells.
|The table calc
performs the calculations, using a lot of auxiliary
variables. It should be neglected.
|Select elev az to see data and diagrams of elevation and azimuth.|
|Select E o T for
data and diagrams of the Equation of Time.
dist to see data and diagrams of the
declination and distance.
|Select orbit to see data and a diagram of the ecliptic orbit.|
"elev" is not taking into account the atmospheric refraction.
the results "elev" (airless) of the spreadsheet with (4
decimal places) of HORIZONS
(NASA JPL) the mean absolute error is only (0,0034 ± 0,0022)°.
the azimuth results "az" of my spreadsheet with the 4 decimal
values of HORIZONS
(NASA JPL) the mean absolute error is (0,0077 ± 0,0024)°.
Diurnal motion of the Sun on May 19 at 50°N, 10°E:
Diurnal motion of the Sun at 50°N, 10°E:
of time can by computed (neglecting nutation in longitude)
E = L0 - 0.0057183° - RA
EoT = 4*E in minutes
Example: 1991, May 19:
Position of the Sun in the ecliptic plane (1991, May 19):
Download my speadsheet:
(Excel, Windows, Mac)
(Multiliyear Interactive Computer Almanac), US
USNO Astronomical Applications Department, Sun
or Moon Rise/Set Table for One Year