Terms of Service
Last updated: November 2026
These terms govern your use of Delta-V Desk. By using the site you agree to them. If you do not agree, please do not use the site.
What the Site Provides
Delta-V Desk offers free calculators and articles about orbital mechanics: orbital velocity, period, escape velocity, Hohmann transfers, the rocket equation and planetary launch windows. The tools implement standard two-body formulas with stated constants and simplifying assumptions, such as instantaneous burns and circular, coplanar orbits.
Educational Use, Not Engineering Advice
The calculators and guides are for education, study and general interest. They do not constitute professional engineering advice and are not a substitute for mission analysis software, numerical orbit propagation, flight dynamics review or the judgement of a qualified aerospace engineer. Results must not be used to plan, command or certify the operation of any real spacecraft, satellite, launch vehicle or rocket, including amateur and high-power rockets. If you use our numbers in coursework, cite your source and check the assumptions your course expects.
Acceptable Use
You may use the site for personal, educational and commercial purposes, including in teaching. You agree not to:
- Attempt to disrupt, overload or gain unauthorised access to the site or its servers
- Scrape or copy the site in bulk by automated means, or republish our articles as your own
- Use the site in any way that breaks the law or infringes the rights of others
- Interfere with the advertising that funds the site, other than through normal browser privacy settings
Intellectual Property
The text, guides, design, logo and code of the site are owned by Delta-V Desk or its licensors and protected by copyright. The formulas themselves, from Kepler, Newton, Tsiolkovsky and Hohmann, belong to everyone. You may quote short passages and share results with attribution and a link to the page. Teachers may display pages in class and reproduce worked examples for students with attribution.
Accuracy and Availability
We work to keep formulas and constants correct, but we do not guarantee that every result is free of error, complete or suitable for a particular purpose. Results depend on the values you enter and on the simplified model. The site is provided "as is" and "as available"; we may change, suspend or withdraw any calculator at any time, and we do not guarantee uninterrupted access.
Limitation of Liability
To the fullest extent permitted by law, Delta-V Desk and its operators are not liable for any direct, indirect, incidental or consequential loss arising from your use of the site or reliance on its results, including lost grades, lost data, failed designs or damage to equipment. Some jurisdictions do not allow certain limitations, in which case our liability is limited to the smallest extent the law allows.
Third-Party Links and Advertising
The site contains advertising and may link to other websites. We do not control and are not responsible for their content, products or practices.
Changes and Governing Terms
We may update these terms; continued use after a change means you accept the updated terms. If any part of these terms is found unenforceable, the rest remains in effect. Questions can be sent to logan.luo@adsnova.cn.