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Greetings Earthlings!

Mars Sky is one of the very few apps designed for use on the surface of Mars. It's the "must-have" explorer's tool should you need the answer to any of the following questions:

- What is the Martian date and time of the place where I crash landed?
- Where is the Earth in the sky so I can send a distress call?
- What is the direction of the Sun so I can find my way to the base?

Even if you're still safe and sound on the Earth, Mars Sky can tell you if it's daylight
where your probe landed, and whether it is in a position for the Earth to receive its signals.


So What Is It?

Mars Sky is a simple map of the sky that shows at a glance the current positions of the sun and planets as seen from a location on the surface of Mars.

The top half of the map shows the sky above the horizon; the bottom half shows the sky below the horizon.

The bodies of the solar system shown on the map include:

- The Sun
- Mercury
- Venus
- Earth
- Jupiter
- Saturn
- Uranus
- Neptune

as well as the moons of Mars:

- Phobos
- Deimos

More exact position data can be found on the Details List screen, such as::

- Distance from Mars
- Apparent Diameter
- Compass Bearing
- Azimuth
- Altitude
- Right Ascension *
- Declination *
- Celestial longitude and latitude *

(* Based on Mars' equator and orbital plane)


What is the Martian Date?

The current Martian sol is shown using the Darian calendar designed by Thomas Gangale in 1985. It is one of several calendars designed for use on Mars but is currently one of the most popular.

There are 24 months of either 27 or 28 days in the Darian year which are named after the constellations of the zodiac; 12 from their Latin names and 12 from their Sanskrit names:

- Sagittarius
- Dhanus
- Capricornus
- Makara
- Aquarius
- Kumbha
- Pisces
- Mina
- Aries
- Mesha
- Taurus
- Rishabha
- Gemini
- Mithuna
- Cancer
- Karka
- Leo
- Simha
- Virgo
- Kanya
- Libra
- Tula
- Scorpius
- Vrishika

For comprehensive information on how the calendar works visit Wikipedia. Future versions of the Mars Sky app may include options to use other Martian calendars.


What Location Coordinates on Mars Can I Use?

Any location on the surface of Mars really. The app comes with a small predefined list of locations of interest such as:

- Olympus Mons
- Cydonia
- Curiosity Rover
- Viking Landers 1 and 2

and most of the probes and rovers that have landed on Mars.

But you can add your own places to the list of locations by entering the longitude and latitude of the place you are interested in.
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