No data is collected by the developer of this app: it does not connect to any network resource for its work (it calculates sunrise/sunset times using an algorithm that uses the data from the device GPS, not by connecting to an online resource), and it does not send any information back to the developer.
(There might be a one-time network connection, as the app uses an Apple font that Apple sometimes does not include on devices, and Apple gets it from its own servers. In any case, any such network activity is outside the knowledge or control of the app developer, and no record of it is maintained by the app. Of course, other network connections under the operation system's control may be happening as well, outside of the knowledge of the app and developer)