Mars Base dot Net - Your porthole to Mars!

Time on Mars - Sunrise, sunset, Earth-rise and Earth-set time on Mars

Mars Finder Chart - Where is Mars in the sky ? This Tool displays a star-chart with the position of Mars in the center!

Mars from Earth - How does Mars look like from Earth ? This Java-Applet displays the appearance of Mars as seen from Earth thru a telescope

Sunrise Sunset Mars-rise Mars-set time on Earth - calculate when this solarsystem bodies rise and set

Solar System Viewer - Where is Mars Express right now ?

Mars Map - Labeled Atlas of the Regions


A day on Mars is called 'sol'.

1. Yesterday ? Today ?

The lander/surface feature sites are sorted by western longitude in ascending order. i.e. Viking1 (47.95W) 04:25 LMST and Olymp. Mons (133.1W) 22:45 LMST, means that it is yesterday at Olympus Mons and Viking1 already is in the current day.

An asterix * at the rise/set times for Earth (see 3.) indicates that the event occurs next earth day. i.e. now it is 18:42 UTC and the event occurs at 20:12* . This means that the event doesn't occur in 1.5 hours, but the next day at 20:12.

2. SR - Sun Rise; SS - Sun Set; ER - Earth Rise; ES - Earth Set:

These times are in Local Mean Solar Time (LMST).
Clocks always display the Mean Time and not the True Time. Therefore these events occur exactly at the time when a Mars-clock would display that time.

3. SRE - Sun Rise Earth; SSE - Sun Set Earth; ERE - Earth Rise Earth; ESE - Earth Set Earth:

These times are in Coordinated Universal Time (UTC) on Earth.
These events occur exactly at the time when an Earth-clock (set to UTC) would display that time. i.e. if you want to find the time when a Mission day begins, look at SRE and you have the time for Earth when the mission-team resumes operations.
Or if you want to know if direct communication to Earth from the surface of Mars is possible, look at ERE and ESE. These times will tell you when the Earth is visible from that particular point on the surface of Mars.

4. MTC - Coordinated Mars Time:

Current mean time on Mars' prime meridian.
The prime meridian is defined at the Airy Crater.
Named after UTC on Earth (Coordinated Universal Time).


5. LMST - Local Mean Solar Time:

The time at a certain location on Mars.
Like MTC, but the longitude of the location is taken into account.

6. LTST - Local True Solar Time:

Represents the time where the sun is exactly in the south at 12:00 noon.
The various orbital elements for Earth and Mars are responsible for the variation of the duration of days and sols. On Earth we define 24 hours to be the duration of an average day. The sun is exactly in the south at 12:00 LTST, but it is bit ahead or a bit behind at 12:00 LMST.

7. MSD - Mars Sol Date:

Similar to the Julian Date (JD) for Earth.
Represents the number of Sols (Mars days) since noon on Dec. 29, 1873.

Copyright notice: Everything on this website is © 2003 by Captain. All rights reserved.
Images of the surface of Mars are © NASA.

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