Evaluate
WOLFRAM

DEMONSTRATIONS
PROJECT
The Equation of Time for a Sundial
angle
relative
to
ecliptic
23
.
45
longitude
of
periapsis
102
.
95
orbit
eccentricity
0
.
016722
0
1
2
3
4
5
6

15

10

5
0
5
10
15
minutes
The equation of time gives the deviation of the apparent "time" determined by the position of the sun on a sundial, to the "mean time" based on uniform motion of the sun.