JavaScript Lunar Eclipse Explorer Index Page

Fred Espenak


The JavaScript Lunar Eclipse Explorer can compute the local circumstances for every lunar eclipse visible from a city for any century from -1499 to 3000 (1500 BCE to 3000 CE). When was the last total lunar eclipse visible from Paris? When is the next partial lunar eclipse visible from Los Angeles? These questions and many others can be answered easily using this new web tool. Pick a geographic location and search for all eclipses visible from that spot over several thousand years.

Begin by selecting one of the geographic areas below and follow the instructions on that page.

For more information about the local circumstances table, see Key to Javascript Lunar Eclipse Explorer.

The JavaScript Solar Eclipse Explorer is a similar web tool for determining the visibility of solar eclipses from any city.


The Javascript Lunar Eclipse Explorer was developed by Chris O'Byrne and Fred Espenak. It features drop-down menus for city coordinates and buttons to select any century from -1499 to 3000 (1500 BCE to 3000 CE). It can be used to explore the frequencey and circumstances of all lunar eclipses visible from any location on Earth.

The Besselian elements and values of ΔT used in Lunar Eclipse Explorer are the same as those used by the Five Millennium Canon of Lunar Eclipses: -1999 to +3000. For the purposes of calculating eclipse circumstances from a given place, the growing uncertainty in the value of ΔT and the corresponding longitude become unacceptably large outside time period of -1499 to 3000 (1500 BCE to 3000 CE).

Permission is freely granted to reproduce this data when accompanied by an acknowledgment:

"Eclipse Predictions by Fred Espenak and Chris O'Byrne ("