Font Licensing
The Gentium Plus typeface is used under the SIL Open Font License, Version 1.1. The font is © 2003–2023 SIL International. Gentium Plus is distributed with the OFL license which permits free use, modification, and embedding, provided that derivative fonts are not sold under the same name.
View SIL Open Font License (OFL) 1.1
Design Inspiration
The visual palette of Roman Solar Time is inspired by the restored medieval colouration of the Prague Astronomical Clock (Orloj), which served as a visual and conceptual reference for the app’s aesthetic design and solar symbolism.
Solar Calculations
Sunrise and sunset times are computed using the Solar Swift library by Chris Hulbert, which implements the US Naval Observatory’s solar position algorithm. The library is open-source and licensed under the MIT License.
View MIT License (Solar Swift Library)
Development Tools
Roman Solar Time was developed using Xcode and SwiftUI, with its companion website built using standard web tools. The app’s diagnostic form uses Getform to facilitate optional bug reporting. The website’s contact form uses Formspree.