Dictionary
mean sun
noun
Definition of MEAN SUN
: a fictitious sun used for timekeeping that moves uniformly along the celestial equator and maintains a constant rate of apparent motion equal to the average rate of apparent motion of the real sun
ADVERTISEMENT
First Known Use of MEAN SUN
1765
Browse
Next Word in the Dictionary: meantime (noun)Previous Word in the Dictionary: means testAll Words Near: mean sun
ADVERTISEMENT
Seen & Heard
What made you want to look up mean sun? Please tell us where you read or heard it (including the quote, if possible).