Credits

Typeface

Text and numbers are set in Geist, by the Geist Project Authors, used under the SIL Open Font License 1.1. The font files are served from this site.

Images

DayReckon uses no photographs. Charts, rings and tables are drawn from our own calculations. Interface icons come from the open-source Lucide set (ISC license).

Data

• Federal holiday dates: Office of Personnel Management, a US government work in the public domain.
• Equinox, solstice and moon phase times: US Naval Observatory, US government, public domain.
• Easter dates: US Census Bureau, US government, public domain.
• Daylight saving time rule: NIST, US government.
• Meteorological season definition: NOAA NCEI, US government.
• Turkey thawing times: USDA Food Safety and Inspection Service, US government.
• Federal Reserve holiday schedule: Federal Reserve Financial Services, cited.
• Expected Ramadan and Eid al-Fitr dates: Fiqh Council of North America, cited as facts.
• School calendar dates: each district's published calendar, cited as facts with a link per row.
• Event dates: Rockstar Games, Take-Two Interactive and the NFL, cited as facts.
• City coordinates: Wikipedia, facts only.

Facts are not copied as text; each page links to its sources. The full list is on the sources page.

Software

The site is built with Astro, an open-source framework under the MIT license, and served by Cloudflare Pages. Sunrise and sunset times are computed with the published NOAA solar position equations.