Apparent Solar Time Calculator
Calculate Local Apparent Solar Time (LAST), also known as true solar time or sundial time. This is the time indicated by the actual position of the Sun in the sky.
Apparent Solar Time (Sundial Time)
Apparent Solar Time
18:25:45.7
True sundial reading
Solar Noon
17:42:54.3
When sun crosses meridian
Mean Solar Time
18:38:40.0
Standard Clock Time
00:08:40.0
263.6 degrees before solar noon
Solar Parameters
Equation of Time
-12.90 min
Time Correction
-342.90 min
Hour Angle
-263.56 deg
Solar Declination
-17.7505 deg
Day of Year
31
Fractional Year Angle
29.10 deg
About Apparent Solar Time
Apparent Solar Time is the time shown by a sundial - it follows the actual position of the Sun. Unlike mean solar time, apparent solar time varies throughout the year because of Earth's elliptical orbit and axial tilt. The difference (Equation of Time) can be as much as +/- 16 minutes. When the EoT is positive, a sundial runs ahead of mean solar time.