Venusian Local time used in the Mars Climate Database
Venusian hours
Venusian hours are (just as their Earth counterparts) defined as lasting
1/24th of a solar day. (1 solar day = 10087200 seconds)
In order
to avoid confusions, we do not use (or define) venusian minutes or seconds:
any (venusian) time of day is always given
as venusian hours and decimal fraction thereof.
Local true solar time
This time corresponds to a Local True Solar Time,
related to the position of the sun in the sky.
Noon occurs when the sun is highest in the sky, at local
true solar time LTST=12.0 venusian hours (in other
words, Local True Solar Time is the value that would be
read on a sundial).
Universal Time on Venus
Universal Venus Time
LTST0
(denoted UVT in the Venus Climate Database) is the Local Time at Longitude 0°
For the sake of simplicity, we do not use or
define time zones. Local True Solar Time LTST at East longitude lon
(in degrees) can be easily computed as:
LTST = LTST0 - lon/15
(the minus here is because Venus has a retrograde (westward) rotation, unlike the other rocky planets)