Javascript Lunar Eclipse Explorer

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The Javascript Lunar Eclipse Explorer can compute the local circumstances for every lunar eclipse visible from a city for any century from -1999 to 3000 (2000 BCE to 3000 CE). When was the last total lunar eclipse visible from London? When is the next partial lunar eclipse visible from New York? These questions and many others can be answered easily using this 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.

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

Jean Meeus has written a stand-alone program for Windows PCs that can make calculations similar to the Javascript Lunar Eclipse Explorer. It is called LUNECJM and is available as a ZIP file.


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 -1999 to 3000 (2000 BCE to 3000 CE). It can be used to explore the frequency and circumstances of all lunar eclipses visible from any location on Earth.

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 -1999 to 3000 (2000 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 (NASA's GSFC)"

2007 Jul 13