Terms of Service
Effective date: September 30, 2026
Agreement to Terms
By downloading, installing, or using LuNAC, or by accessing the LuNAC website (lunac.app), you agree to be bound by these Terms of Service. If you do not agree, do not use the application or website.
Description of Service
LuNAC is an astronomical calendar that computes celestial event times, lunar phases, planetary positions, and related data using the astronomy-engine library. The initial production release requires a LuNAC account and provides all registered application features without a subscription or purchase.
Accounts
LuNAC requires you to create an account using an email address and password, or to sign in with Google, before accessing application features. You are responsible for maintaining the security of your account credentials. You must provide accurate information when creating an account.
Account Deletion
You may delete your account at any time from within the app (More > Account > Delete Account) or by emailing hello@lunac.app. Account deletion uses a 30-day grace period. During this period, your account is suspended. You may sign back in to cancel deletion during the grace period. After the grace period, the backend may permanently delete your account and associated server data. Account-owned data retained locally on a device remains inaccessible without the same authenticated account and is not erased merely because a client-side deadline has passed. For details on what data is deleted and what may be retained, see our Privacy Policy.
Access and Payments
The initial production release does not offer or require a subscription or in-app purchase. All registered application features are available after successful account authentication. Any future paid offering would require separate implementation, store configuration, and updated disclosures before activation.
Privacy and Activity Reporting
Our Privacy Policy explains account information, cloud sync, website analytics, crash reporting and optional account activity reporting. Account activity reporting is not currently activated. When available, it will follow the separate in-app notice and account-wide control described in that policy. Turning activity reporting off does not remove application features. Acceptance of these Terms does not replace that notice or override your reporting choice.
License to Use
LuNAC grants you a personal, non-exclusive, non-transferable, revocable license to use this application for personal, non-commercial purposes. This license does not include the right to sublicense, resell, or distribute the application or its data.
Intellectual Property
The LuNAC application, including its design, code, icons, and bundled astronomical data, is the intellectual property of its developers. All content on the LuNAC website, including text, design, and branding, is the property of LuNAC and protected by applicable intellectual property laws. Astronomical computation results are generated using the open-source astronomy-engine library. Moon texture imagery is derived from the LROC WAC WAC_EMP product, "Empirically Normalized 7-Color Reflectance of the Moon" (NASA/LRO). Source citation: Boyd, A. K., Robinson, M. S., & Sato, H. (2012), Lunar Reconnaissance Orbiter wide angle camera photometry: An empirical solution, Lunar and Planetary Science Conference, Vol. 43, abstract #2795. See docs/legal/ASSET_CREDITS.md for the full asset record.
Astronomical Accuracy
LuNAC computes astronomical data deterministically using the astronomy-engine library. All celestial event times, positions, and related data are the output of mathematical computation and are presented for informational purposes only.
LuNAC does not guarantee that computed values are suitable for navigation, safety, agriculture, or any professional application. Computed outputs may differ from other sources due to differences in algorithms, reference frames, or time scales. You assume all responsibility for how you use this information.
User Content
You retain ownership of any observations, schedule entries, or notes you create within LuNAC. You are solely responsible for the content you create. When you enable cloud sync or submit content to us, LuNAC processes that content to provide the requested service as described in the Privacy Policy. Account activity reporting does not collect that content.
Website Usage
The LuNAC website (lunac.app) is provided for informational purposes. You agree not to misuse the website or attempt to access it through automated means beyond normal browsing.
Waitlist Participation
Joining the waitlist does not guarantee access to LuNAC at any specific time or at all. We reserve the right to manage the waitlist at our discretion. By submitting your email address to the waitlist, you request a confirmation and an availability notice. Additional promotional communications require a separate opt-in. You may unsubscribe at any time.
Acceptable Use
You agree not to reverse engineer, decompile, or disassemble the application, except to the extent that such activity is expressly permitted by applicable law. You agree not to use the application for any unlawful purpose.
No Warranty
LuNAC is provided "as is" and "as available," without warranty of any kind, express or implied. To the fullest extent permitted by applicable law, we disclaim all warranties including, without limitation, implied warranties of merchantability, fitness for a particular purpose, and non-infringement. The LuNAC website is provided "as is" without warranties of any kind. We do not guarantee uninterrupted access or error-free operation of the website.
Limitation of Liability
To the fullest extent permitted by applicable law, the developers of LuNAC shall not be liable for any indirect, incidental, special, consequential, or punitive damages arising from your use of the application, even if advised of the possibility of such damages. Our total liability for any claim arising from these terms shall not exceed the amount you paid for the application in the twelve months preceding the claim.
Service Availability
LuNAC does not guarantee uninterrupted or error-free access to the application. We may suspend, modify, or discontinue features at any time without notice. Pre-generated astronomical data bundled with the application is available offline and is not dependent on network connectivity.
Termination
We may suspend or terminate your access to LuNAC at any time for violation of these terms. You may stop using LuNAC at any time by uninstalling the application. You may delete your account as described in the Accounts section above. Upon termination, your license to use the application ceases. Provisions that by their nature should survive termination (including limitation of liability, no warranty, and governing law) will survive.
Changes to These Terms
We may update these terms from time to time. The updated version will be included in a future application update and on the LuNAC website. The effective date above will be updated accordingly. Continued use of LuNAC after an update constitutes acceptance of the revised terms.
Governing Law
These terms are governed by the laws of the State of South Dakota, United States. Any disputes arising from these terms shall be resolved in the courts of that jurisdiction.
Contact
For questions about these terms, contact: hello@lunac.app