Privacy Policy
Last updated: November 2026
This policy explains what information Delta-V Desk collects, how it is used and the choices you have. Delta-V Desk is a free set of orbital mechanics calculators for orbital velocity, orbital period, escape velocity, Hohmann transfers, the rocket equation and planetary launch windows. Many visitors are students, so the site is built so that nothing you type into a calculator needs to leave your device.
Summary
All calculations run in your browser. Altitudes, periods, masses, specific impulses and the bodies or planets you select are processed by JavaScript on your own device and are not sent to our servers. There are no accounts, no logins and no saved missions. We receive only routine technical information about page visits, and, where advertising is shown, our advertising partner processes data as described below.
Information You Enter
The calculators accept values such as:
- Orbit altitudes, periapsis and apoapsis heights and orbital periods
- The central body chosen, such as Earth, the Moon or Mars
- Stage masses, propellant masses, specific impulse and target Δv figures
- Pairs of planets for launch window calculations
None of these values leave your browser, and we have no way to see them. If you are working on a confidential design for a course project or a company, the numbers stay on your machine. Reloading or closing the page clears them.
Information Collected Automatically
Like almost every website, our hosting servers record standard request information when a page is loaded: your IP address, the date and time, the page requested, the referring page, and your browser and operating system as reported in the user agent. We use these logs to keep the site running, to understand which calculators and guides are read, and to detect abuse such as automated scraping. We do not use them to build profiles of individual visitors.
For example, our logs might tell us that the Hohmann transfer calculator was visited 300 times last week, mostly from desktop browsers, but not who those visitors were or what orbits they entered.
Cookies
The calculators themselves do not need cookies. Cookies on this site are set by our advertising partner when advertising is shown, and by the content delivery network that protects the site and speeds it up. You can block or delete cookies in your browser settings; the calculators will keep working.
Advertising and Google AdSense
This site uses Google AdSense to show advertising. Google and its partners use cookies and similar technologies to serve ads based on your previous visits to this and other websites, to limit how often you see an ad and to measure ad performance. Google’s use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and other sites on the internet.
- You can opt out of personalised advertising from Google at Google Ads Settings.
- You can opt out of personalised advertising from many other vendors at www.aboutads.info/choices or, in Europe, www.youronlinechoices.eu.
- Google explains how it uses information from sites that use its services at policies.google.com/technologies/partner-sites.
Visitors in the European Economic Area, the United Kingdom and Switzerland are asked for consent before personalised advertising cookies are used. If you decline, you may still see non-personalised ads, which are based on the page you are reading, such as a page about rocket propulsion, rather than on your history.
How We Use Information
- To operate, secure and improve the site and its calculators
- To understand which tools and guides are useful, so we know what to improve or add
- To reply when you email us
- To show advertising that funds the site
We do not sell personal information, and we do not share it except with service providers that help run the site, such as hosting, the content delivery network and advertising, or where the law requires it.
If you write to us at logan.luo@adsnova.cn, we receive your email address and whatever you include in the message, such as a textbook problem or a set of calculator inputs. We use it only to reply and to fix the issue you report, and we delete correspondence when it is no longer needed.
Data Retention
Server logs are kept for up to 30 days and then deleted or aggregated into anonymous visit counts. Emails are kept for up to 12 months after the conversation ends, unless they document a correction we made, in which case we keep a short note of the problem without your contact details. Advertising data is retained by Google according to its own policies.
Your Rights Under the GDPR
If you are in the European Economic Area or the United Kingdom, you have the right to access the personal data we hold about you, to have it corrected or erased, to restrict or object to its processing, to data portability and to withdraw consent at any time. Our legal bases are legitimate interests for server logs and site security, consent for personalised advertising cookies, and your request when you email us. You may also complain to your local data protection authority.
Your Rights Under the CCPA
If you are a California resident, you have the right to know what personal information we collect and how it is used, to request deletion, to correct inaccurate information and to opt out of the sale or sharing of personal information. We do not sell personal information for money. Advertising cookies may count as sharing for cross-context behavioural advertising; you can opt out through Google Ads Settings or the industry opt-out pages listed above. We will not treat you differently for exercising these rights.
To exercise any of these rights, email logan.luo@adsnova.cn with "Privacy request" in the subject line. We may need to ask for information to confirm the request is yours.
Children’s Privacy
Orbital mechanics is studied in secondary school, and younger students may use the calculators. The site is not directed at children under 13, and we do not knowingly collect personal information from them. Nothing a student types into a calculator is collected. If you believe a child under 13 has emailed us personal information, contact us and we will delete it. Teachers may use the site in class without students creating accounts or providing any details.
Links to Other Sites
Our pages and guides may link to space agencies, textbooks, ephemeris services and other external resources. We are not responsible for their privacy practices, and we encourage you to read the policies of any site you visit.
Security
The site is served over HTTPS. Because calculator inputs never reach our servers, there is no stored record of them to protect or to lose.
Changes to This Policy
We may update this policy when the site or the law changes. The date at the top shows the latest revision.
Contact
Questions about this policy can be sent to logan.luo@adsnova.cn.