This document is part of the Martian Time Boneyard. It was originally located at http://www.reference.org/victorian_space/mars_and_the_martians/time_keeping.htm.
Author: Damon Dean

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Victorian Space

Martian Time Keeping

Introduction
The Martian day is twenty-four Earth hours and thirty-seven Earth minutes long. There are eight Martian time zones on Mars. The Date Line Meridian is centered on the home of Seldon II, at Syrtis Major. The official standards clock is located in the Imperial Palace. Local time is calculated by adding or subtracting hours from this source.

The Martian day starts at sunrise, at the hour of zero. Their day is divided into eight 'hours.' These 'hours' are divided into eight 'sub-hours.' The 'sub-hours' are divided into eight 'minutes.' These 'minutes' are divided into eight 'sub-minutes.' The 'sub-minutes' are divided into eight 'seconds.' These 'seconds' are divided into eight 'sub-seconds.' Remember, Martians use base eight in all their math.

When written in English, the convention is to place in groups; the hour and sub-hour, the minute and sub minute, and the second with the sub-second. A colon (:) separates the hour and sub-hour; a single quote mark (') separates the minute and the sub-minute, and a double quote mark (“) separates the second from the sub-second. The digits used for time keeping range from zero to seven.

Page Index
Name Description
time_keeping.htm#Time Conversion Table">Time Conversion Table The Martian day is twenty-four Earth hours and thirty-seven Earth minutes long.
Notes The top figure in each box is for use with a clock set for earth standard time. The bottom figure in each box is for a clock adjusted to the longer Martian day.
Converting Let's do a sample conversion.
Time Conversion Table
Earth Clock/
Martian Clock
Earth
Day
Earth
Hour
Earth
Minute
Earth
Second
Martian
Day
1.0550000
days
0.9749492
days
24.616667
hours
32.398781
hours
1477.0000
minutes
1403.9269
minutes
88620.000
seconds
84235.613
seconds
Martian
Hour
0.1187500
days
0.1282118
days
3.1650000
hours
3.0770833
hours
189.90000
minutes
184.62500
minutes
11394.000
seconds
11077.500
seconds
Martian
Sub-hour
0.0148438
days
0.0160273
days
0.3562500
hours
0.3846540
hours
21.375000
minutes
23.079240
minutes
1282.5000
seconds
1384.7544
seconds
Martian
Minute
0.0018555
days
0.0020030
days
0.0445314
hours
0.0480819
hours
2.6718840
minutes
2.8849140
minutes
160.31304
seconds
173.09840
seconds
Martian
Sub-minute
0.0002319
days
0.0002504
days
0.0055665
hours
0.0060090
hours
0.3339900
minutes
0.3605400
minutes
20.039400
seconds
21.632400
seconds
Martian
Second
0.0000290
days
0.0000313
days
0.0006957
hours
0.0007512
hours
0.0417420
minutes
0.0450720
minutes
2.5045200
seconds
2.7043200
seconds
Martian
Sub-second
0.0000036
days
0.0000039
days
0.0000870
hours
0.0000939
hours
0.0052200
minutes
0.0056340
minutes
0.3132000
seconds
0.3380400
seconds
Notes
The top figure in each box is for use with a clock set for earth standard time. The bottom figure in each box is for a clock adjusted to the longer Martian day (plus 37 minutes, or a speed reduction of about 3%).

For reference, Earth time is: one day divided into twenty-four hours, one hour is divided into sixty minutes, one minute is divided into sixty seconds. One Earth day equals 24 hours, or, 1440 minutes, or, 86,400 seconds.

For quick calculations, the approximate conversion factors are; one Martian day = one earth day, one Martian hour = three Earth hours, one Martian minute = three Earth minutes, one Martian second = three Earth seconds.

Converting
Let's do a sample conversion. Uumotaak The Bold has sent you a message. It is in English (thank goodness.) “Meet me at bazaar, get stuff from Tycuus, must be there at 2:7, urgent!” The time is expressed in Martian notation (in English.) The Martian hour is two, and the sub-hour is seven. To find the Earth hour, we multiply 2 x 3.077, and get 6.154 Earth hours. To find the sub-hour conversion to Earth hour, we multiply 7 x 0.384, to get 2.688 Earth hours. We add 6.154 + 2.688, and get 5.765 Earth hours. To convert the portion of an Earth hour to Earth minutes, we multiply 0.765 x 60, which gives us 45.9 Earth minutes. We are not concerned with seconds, so we round the minutes to 46. Adding the 46 Earth minutes to the 5 Earth hours gives us (in Earth clock time) 5:46.

A quick glance at your pocket watch tells you that it is 11:15 am. We blew it... or did we? The Martian day starts at sunrise! So we add another six Earth hours (midnight through sunrise local time) to the time of 5:46, and get 11:46 am. We have thirty-one minutes to get to the bazaar (better hustle)!

The conversion factors we used were drawn from the Martian Clock time row on the table below. You did remember to calibrate your pocket watch to Martian time, didn't you?

Author: Damon Dean damon@reference.org
 
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