JavaScript Solar Eclipse Explorer

EUROPE

Instructions

The JavaScript Solar Eclipse Explorer can compute the local circumstances for every solar eclipse visible from a city for any century from -1499 to 3000 (1500 BCE to 3000 CE). Just follow these instructions:

Section 1 - Select a city from the drop-down menu or manually enter the geographic coordinates and time zone.
Section 2 - Choose the minimum eclipse magnitude value to include in the search.
Section 3 - Choose the desired century by clicking the button.
Section 4 - A table will be generated giving the local circumstances for every eclipse visible from the city.

All times are displayed in local time using the value from the Time Zone field in Section 1 (add 1 hour for Daylight Saving Time). A time followed by "(r)" means the event is already in progress at sunrise. Similarly, a time followed by "(s)" means the event is still in progress at sunset. In such cases, the times and circumstances given are for sunrise or sunset, respectively. The times of sunrise and sunset are calculated when the Sun's lower limb touches the horizon.

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

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

Section 1: City Coordinates

Choose city, or enter coordinates:

Name:
Latitude:	deg min sec
Longitude:	deg min sec
Altitude:	meters
Time Zone:

Section 2: Eclipse Magnitude Search Criteria

Choose minimum eclipse magnitude* for search:

magnitude ≥ 0.0 (all eclipses) magnitude ≥ 0.25 magnitude ≥ 0.50 magnitude ≥ 0.75 magnitude ≥ 0.90

* Eclipse magnitude is the fraction of the Sun's diameter obscured by the Moon.

Section 3: Century Selection

Choose century*:

* Negative years are equivalent to the year BC minus 1 year (See: Dating Conventions ).

Section 4: Eclipse Predictions

A time followed by "(r)" means the event is already in progress at sunrise, while a time followed by "(s)" means the event is still in progress at sunset. In such cases, the times and circumstances given are for sunrise or sunset, respectively.

Negative years are equivalent to the year BC minus 1 year (See: Dating Conventions ).

Acknowledgments

The JavaScript Solar Eclipse Explorer is based on the JavaScript Solar Eclipse Calculator created by Chris O'Byrne and Stephen McCann. The original calculator predicts the local circumstances for any single eclipse over the period 1970 to 2039 for a geographic position supplied by the user.

The Eclipse Explorer presented here 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 solar eclipses visible from any location on Earth. The Eclipse Explorer was developed by Chris O'Byrne and Fred Espenak.

The Besselian elements and values of ΔT used in JavaScript Solar Eclipse Explorer are the same as those used by Five Millennium Canon of Solar 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 (NASA's GSFC)"