Use the following interface to compute, for a given Earth date and time,
corresponding Martian date and solar longitude Ls of Mars.
Simply enter the desired Earth date and time, or click on the buttons
to (re-)set these values, and then click on the
"Convert Earth Date and time to Martian Date and Solar Longitude"
button to obtain the corresponding Mars date (note that the Julian date
corresponding to the supplied Earth date is also given on output
but may not be specified as an input parameter).
See also our Mars date to Earth
date converter
and the page on Martian
seasons and solar longitude for more information.
About the interface and its outputs
Javascript is used for the computations; so if your browser doesn't
use Javascript, either because it can't (a rare event) or because its
"enable Javascript" option is turned off (most likely), the
interface won't work.
Solar Longitude is given in degrees and thus ranges from 0 to 360.
Martian Years are numbered according to the calendar proposed by
R. Todd Clancy (Clancy et al., Journal of Geophys. Res 105, p 9553, 2000):
Martian Year 1 begins (at a time such that Ls=0) on April 11th, 1955.
Given values of Martian Months are directly (and strictly) computed
from Ls values (i.e.: 1st month if Ls is less than 30,...), regardless
of the fact that months thus defined do not correspond to an integer
number of sols.
Given values of Sol number are also strictly
(albeit rounded to be given as integers and such that a martian year begins
at sol number 1) computed from Ls values. Note that
because a martian year spans 668.6 sols, the last (669th) sol of the year is
thus, with this simplistic labeling, much shorter than the others.