Last updated: 2026-10-26

Terms of Use

What is real and what is original

Real data

The missions, images, relief, the “Mars by the Numbers” figures, planetary positions and the facts of exploration are based on real data from space agencies and scientific sources (NASA, ESA, JPL, CNSA and others). They are rounded and simplified for outreach purposes.

The Martian calendar is the author’s own

The Martian calendar (Martian Horizon Time Standard, MH-STD-001) is a creation of the site’s author: it is not official and no space agency recognises it. It has been built with great rigour and links faithfully and consistently with the rest of the site (missions, events, converter and orbital map), but it is a standard of its own.

The Mars Atlas is fiction

The Mars Atlas is a futuristic vision of how Mars might develop around Martian year 100. Its cities, roads, ports and populations do not exist and do not follow any real plan: it has nothing to do with reality, except that certain original place names and the planet’s real relief have been used as a base.

None of it should be used to plan real missions or is presented as official information. See the Terms of Use and the Credits.

1. Educational purpose

Everything Martian Horizon offers — the Martian calendar, the Earth–Mars time converter, the 3D orbital map, the Control Room and the data shown — is for educational and astronomy outreach purposes.

2. Nature of the calculations

The MH-STD-001 Martian calendar is this project’s own civil standard; it is not an official calendar of any space agency.
Planetary positions, trajectories, launch windows, seasons (Ls) and signal delays are computed with simplified models: they are educational approximations, not precision ephemerides.
The Mars Atlas is a futuristic, fictional vision of Mars’s development around Martian year 100: its cities, roads, ports, regions and populations are invented and have nothing to do with reality, although certain original names and the planet’s real relief have been used as a base.
The sections on missions, images, relief and figures of Mars are based on real data from agencies and scientific sources, rounded and simplified for outreach; the calendar is the author’s creation and the fictional parts are identified as such.
Nothing shown should be used for planning real missions, navigation or other critical decisions.

3. Permitted use

You may freely use the site to learn, teach and share, and quote its content with a link to martianhorizon.com. Automated mass use (systematic data extraction, service overload) and uses that break the law or third-party rights are not allowed.

4. No warranties

The service is provided “as is”. The owner is not liable for damages arising from use of the information or temporary unavailability. Content and these terms may be changed or withdrawn at any time.

5. More information

See the Legal Notice, the Privacy Policy and the Cookie Policy.

1. Educational purpose

2. Nature of the calculations

3. Permitted use

4. No warranties

5. More information

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