Explanation

The Solar Eclipse Circumstances Calculator can compute the local circumstances for a solar eclipse as seen from from hundreds of cities in any geographic region. The followig key describes the data found in the local circunstances tables.

Column     Heading     Definition/Description
          
   1        City       The name of the city and country 
            Name       (country names are the ISO 3-Letter Country Code Abbreviations (Wikipedia).

   2      Eclipse      Eclipse Type as seen from the city, where:
            Type         P  = Partial Eclipse.
                         A  = Annular Eclipse.
                         T  = Total Eclipse.


   3      Partial      The Time when partial eclipse begins.  
          Eclipse      
          Begins       

   4        Sun        The Sun's altitude (in degrees) when partial eclipse begins.
            Alt

   5      A or T       The Time when annular or total eclipse begins.  
          Eclipse      
          Begins       

   6      Maximum      The Time at maximum eclipse.  
          Eclipse      

   7        Sun        The Sun's altitude (in degrees) at maximum eclipse.
            Alt

   8      A or T       The Time when annular or total eclipse ends.  
          Eclipse      
           Ends       

   9      Partial      The Time when partial eclipse ends.  
          Eclipse      
           Ends       

  10        Sun        The Sun's altitude (in degrees) when partial eclipse ends.
            Alt

  11      Eclipse      Eclipse magnitude is the fraction of the Sun's 
            Mag.       DIAMETER obscured by the Moon. 
                       For annular eclipses, it is less than 1.0.
                       For total eclipses, it is greater than or equal to 1.0.

  12      Eclipse      Eclipse obscuration is the fraction of the Sun's 
            Obs.       AREA obscured by the Moon. 

  13      A or T       Duration of total or annular phase
          Eclipse      of the eclipse (in minutes and seconds).
          Duration
          

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.

---

Acknowledgments

Some of the JavaScript code in the Solar Eclipse Circumstances Calculator is based on the Solar Eclipse Calculator created by Deirdre O'Byrne and Stephen McCann in 2003. The original calculator predicted the local circumstances for any single eclipse over the period 1970 to 2039 for a single geographic position supplied by the user. Bill Kramer (Eclipse-Chasers.com) has expanded this code to work with dozens of cities in the geographic region of the user's choice.

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

"Eclipse Predictions by Fred Espenak (EclipseWise.com)"