Octant — Terms of Use and Licence
Copyright © 2026 TrixHouse. All rights reserved.
Version 1.0 · 10 August 2026
Not legal advice. These terms were drafted by the author, not by a lawyer. They are
written to be clear and honest rather than exhaustive, and they should be reviewed by a
qualified professional before they are relied on — particularly the commercial licence,
which
docs/PRODUCT.md§8b makes a revenue mechanism rather than a formality.
1. What Octant is
Octant is a hosted web application for preliminary space mission analysis. It runs entirely
in your browser: there is no account, no server-side computation, and your orbit parameters
are never transmitted to us.
Because Octant is hosted rather than installed, these are primarily terms of use. Your
browser does receive a copy of the compiled application in order to run it, so §3 grants the
licence that makes that lawful.
2. Permitted use — free of charge
You may use Octant free of charge, without registering, for:
- Personal use — learning, curiosity, personal projects.
- Academic use — teaching, coursework, theses, and academic research, including work
funded by public research grants.
- Evaluation — assessing whether Octant is suitable for professional use, for a
reasonable period.
You may publish, cite and reproduce results you obtain, including in theses, papers and
presentations. Attribution is appreciated and, for published work, expected. A suggested
form is given in §9.
3. Licence granted to you
For the permitted uses in §2, you are granted a personal, non-exclusive, non-transferable,
revocable licence to load and run the Octant application in a web browser.
That is the whole of it. No other rights are granted, expressly or by implication.
4. Commercial use
Commercial use requires a separate written licence. Commercial use means use in, for, or
in support of a business, a funded commercial project, a paid engagement, or work performed
for a client — whether or not Octant's output appears in a deliverable.
Commercial use is not prohibited. It is not yet priced. If Octant is useful to your work,
that is the outcome this project wants; get in touch and terms will be agreed. Small
companies and early-stage ventures should expect terms that reflect that.
Contact: hello@trixhouse.dev
5. What you may not do
Without prior written permission, you may not:
- Copy, redistribute, host, mirror or sublicense Octant or any substantial part of it.
- Reverse engineer, decompile or disassemble any part of Octant, including the compiled
JavaScript delivered to your browser, except to the extent this restriction is
unenforceable under applicable law (in the EU, Directive 2009/24/EC preserves certain
interoperability rights, which these terms do not attempt to override).
- Remove or obscure attribution, the preview watermark, or copyright notices from
Octant's interface or its exported output.
- Represent Octant's output as certified, validated or assured beyond what
the validation page states.
- Use Octant to develop or support the activities excluded in §7.
6. No warranty, and what that means here
Octant is provided "as is", without warranty of any kind, express or implied, including
merchantability, fitness for a particular purpose and non-infringement. To the maximum
extent permitted by law, TrixHouse is not liable for any loss arising from its use.
That is boilerplate. This is not:
Octant is a preliminary analysis tool, and its interactive propagation is approximate.
It uses analytical mean-element theories that omit atmospheric drag, solar radiation
pressure and third-body attraction. Against a full numerical force model the difference
reaches roughly 3.3 km over 24 hours in low Earth orbit. The interface names the model
behind every number, and the validation page
publishes what has and has not been checked.
**Do not use Octant as the sole basis for a design decision, an operational decision, a
manoeuvre, or anything with a spacecraft, a launch or a budget at the end of it.** Verify
independently. That is not a disclaimer to hide behind; it is how the tool should be used.
7. Scope — what Octant does not do
Octant models passive bodies only: objects that cannot steer. It does not model, and
will not model, guided atmospheric entry, targeting, manoeuvring re-entry vehicles, or
launch-vehicle trajectory optimisation. This is a deliberate limit on dual-use grounds and
is not subject to request. See docs/PRODUCT.md §6.
You may not use Octant in connection with the design or development of weapons, or in
violation of applicable export-control law, including EU Regulation 2021/821.
8. Privacy
Your orbit parameters never leave your machine, because there is no server to send them to.
Octant records page views and the host of the referring site, so it can tell whether
anyone is finding it. No cookies, no fingerprinting, no personal data, no third-party
trackers, and nothing sold or shared. Selecting a NASA imagery layer causes your browser to
request map tiles from NASA; the orbit computation still runs locally.
9. Attribution
For published work:
Octant (2026), preliminary space mission analysis, TrixHouse.
https://octant-space.pages.dev
Octant's own results are produced by Orekit, which deserves the
larger share of any credit.
10. Third-party components
Octant is built on open-source and public-domain work carrying its own terms, which these
terms do not override and cannot. See NOTICES.md.
11. Changes, termination, and law
These terms may change; the version and date at the top will change with them. Continued use
after a change constitutes acceptance. Your rights under §2 end if you breach these terms.
Governed by French law, with disputes subject to the courts of France, except where
mandatory consumer-protection law in your country of residence provides otherwise.
**Questions, commercial licensing, academic use, or anything unclear:
hello@trixhouse.dev**