Last updated: March 17, 2026
These Terms of Service (“Terms”) govern your use of PyDIET (the “Service”), operated by CFHT, a U.S.-based non-profit research organization. By accessing or using the Service, you agree to these Terms.
The Service provides an exposure time calculator (ETC) intended for academic, research, and educational purposes. The Service is provided without user authentication and may be accessed via a web interface or API.
The underlying code of the Service is made available under the MIT License. Your use of the source code is governed by the terms of that license.
The Service is provided “as is” and “as available,” without warranty of any kind, express or implied, including but not limited to warranties of accuracy, reliability, fitness for a particular purpose, or non-infringement.
The results produced by the Service are estimates only and may not reflect actual observational or instrumental performance.
To the fullest extent permitted by applicable law, CFHT shall not be liable for any direct, indirect, incidental, consequential, or special damages arising out of or in connection with the use of, or inability to use, the Service, including but not limited to errors in calculations, scientific results, or observational planning.
You agree to use the Service only for lawful purposes and in a manner consistent with its intended academic and research use. You are solely responsible for how you interpret and use the results.
CFHT reserves the right to modify, update, or discontinue any aspect of the Service at any time without notice.
This includes, but is not limited to, changes in instrument models, calibration data, algorithms, or implementation details, which may result in differences in the outputs produced by the Service over time.
The Service may be unavailable from time to time due to maintenance, updates, or technical issues. No guarantee of uptime or availability is provided.
The Service may be accessed programmatically via an API. Excessive or abusive use may be restricted to ensure fair access and system stability.
These Terms shall be governed by and construed in accordance with the laws of the United States, without regard to conflict of law principles.
These Terms may be updated from time to time. Continued use of the Service after changes are posted constitutes acceptance of the revised Terms.
For questions regarding these Terms, please contact:
Last updated: March 17, 2026
This Privacy Policy describes how PyDIET (“the Service”), operated by CFHT, a U.S.-based non-profit research organization, collects and uses information when you access or use the Service.
The Service is an academic web-based exposure time calculator accessible worldwide. It does not require user accounts or authentication.
The Service does not require or collect personal information such as names, email addresses, or account credentials.
When you access the Service, our servers may automatically record limited technical information in standard server logs, including:
This information is collected solely for operational, security, and debugging purposes.
The Service may use your browser’s local storage to save application settings, such as preferences. This data remains on your device and is not transmitted to our servers.
We use the limited data we collect to:
We do not use your data for profiling, advertising, or marketing purposes.
For users in the European Economic Area or the United Kingdom, processing of technical log data is based on our legitimate interests in ensuring the security, stability, and proper functioning of the Service.
Server logs are retained only for the minimum period required by applicable laws and institutional policies, after which they are deleted or anonymized.
We do not sell, rent, or share personal data with third parties.
Data may be disclosed only if required by law or as reasonably necessary to protect the security and integrity of the Service.
The Service is operated from the United States. By using the Service, you acknowledge that technical information described in this Privacy Policy may be processed in the United States.
Depending on your jurisdiction, you may have rights regarding your personal data, including rights to access, correct, delete, or object to certain processing.
Because we do not maintain user accounts or directly identifiable user profiles, we may not be able to link technical log data to a specific individual except where required by law and reasonably feasible.
The Service is intended for academic and general audiences and does not knowingly collect personal data from children.
We implement reasonable technical and organizational measures to protect the Service and associated data, including standard web security practices.
This Privacy Policy may be updated from time to time. Updates will be posted on this page with a revised “Last updated” date.
For questions about this Privacy Policy, please contact: