About this site and our methods

Eclipse 2027 Map is an independent website about the total solar eclipse of 2 August 2027. It is not affiliated with NASA, ESA, IGN or any astronomy organisation. Everything on it is calculated from public scientific data, and the method is described below so that you can check it.

How eclipse times are calculated

Times, the path of totality, totality duration and the share of the Sun covered are computed from the Besselian elements published by Fred Espenak (NASA Goddard Space Flight Center), with ΔT = 71.7 s, using the classical method of the Explanatory Supplement to the Astronomical Almanac. The same code runs on our server when the pages are built and in your browser when you tap the map.

How we checked the accuracy

We compared our results with independent sources for 11 places (Cádiz, Málaga, Seville, Tarifa, Tangier, Benghazi, Luxor, Jeddah, Madrid, Rome, Berlin) and with the NASA path table. Largest differences:

• NASA path table, 101 points: limits and central line within 0.2 km, central-line duration within 0.2 s
• NASA local-circumstances calculator: 0.0 s for every contact
• timeanddate.com: up to 4.9 s
• Xavier Jubier's calculator: up to 5.1 s
• IGN Spain municipality table: up to 8 s (IGN uses its own ΔT and town coordinates)

No published prediction, ours included, accounts for the mountains on the edge of the Moon (the lunar limb profile). They can shift contact times by 1 to 3 seconds and the edges of the path by 1 to 3 km. Near the edge of the path, stay a few kilometres inside it.

Data sources

• Eclipse elements: NASA GSFC, Fred Espenak (public domain).
• Places and names: GeoNames (CC BY 4.0).
• Historical cloud cover: NASA POWER, CERES SYN1deg satellite product, 2001 to 2025.
• Cloud forecast: ECMWF open data (CC BY 4.0), shown in the last days before the eclipse.
• Maps: OpenFreeMap, © OpenStreetMap contributors; coastlines from Natural Earth.

⬇ Download the data (CSV): times for all 583 places

How the site is funded

The site is free. It is paid for by advertising and partner links (accommodation, car rental, tours, eclipse glasses). Partners have no influence on times, maps or weather figures. Affiliate disclosure