<p>I found this NASA website which says that to predict eclipse, we should solve the Besselian elements ..what does this mean, how can I solve for Besselian elements? Is there a numerical method? I need to find the circumstance (length of eclipse etc) at a given coordinate..Sorry I am  very new to astronomy so my question might be basic..
<a href="https://i.sstatic.net/qXUJN.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/qXUJN.png" alt="see the picture below"></a></p>

CC BY-SA 4.0
2019-06-10T15:50:56.850Z
Are you looking at this for a particular, known eclipse? Looks like your details are for the July 2nd Total Solar eclipse,  which case, the NASA website has an interactive tool for finding durations at particular locations. The one for the eclipse in question is at https://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2019Jul02Tgoogle.html, and you can click on coordinates in the eclipse path to pull durations.
notovny
CC BY-SA 4.0
2019-06-10T17:26:26.070Z
So is your question "what is the definition of Besselian elements of [something]"?   I get the feeling you need to read the entire site -- and BTW please post a link to that specific NASA page so we can evaluate what's going on there.
Carl Witthoft
CC BY-SA 4.0
2019-06-11T03:56:39.357Z
Looks like it's [this NASA page](https://eclipse.gsfc.nasa.gov/SEsearch/SEdata.php?Ecl=20190702). I would imagine Jean Meeus's _Astronomical Algorithms_ book would have info on using Besselian elements to calculate eclipse circumstances; unfortunately my copy is at work and not to hand
astrosnapper
CC BY-SA 4.0
2023-04-16T19:52:54.957Z
I think this question was incorrectly closed, the question is quite clear, and an example implementation is available here: https://www.celestialprogramming.com/MeeusEclipseExamples/example02.html .  Results are in the JavaScript console, view the source for the equations, it is from Meeus' "Elements of Solar Eclipses".
Greg Miller
<fundamental-astronomy><solar-eclipse><positional-astronomy><moon-phases><mathematics>
evaluate solar eclipse Besselian elements?
S Tom
# evaluate solar eclipse Besselian elements?

(Asked by: username_0 on 2019-06-10)

I found this NASA website which says that to predict eclipse, we should solve the Besselian elements ..what does this mean, how can I solve for Besselian elements? Is there a numerical method? I need to find the circumstance (length of eclipse etc) at a given coordinate..Sorry I am very new to astronomy so my question might be basic..
[![see the picture below](https://i.sstatic.net/qXUJN.png)](https://i.sstatic.net/qXUJN.png)

**Tags:** fundamental-astronomy, solar-eclipse, positional-astronomy, moon-phases, mathematics

> **Comments:**
> **username_1**: Are you looking at this for a particular, known eclipse? Looks like your details are for the July 2nd Total Solar eclipse,  which case, the NASA website has an interactive tool for finding durations at particular locations. The one for the eclipse in question is at https://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2019Jul02Tgoogle.html, and you can click on coordinates in the eclipse path to pull durations.  
> **username_2**: So is your question "what is the definition of Besselian elements of [something]"?   I get the feeling you need to read the entire site -- and BTW please post a link to that specific NASA page so we can evaluate what's going on there.  
> **username_3**: Looks like it's [this NASA page](https://eclipse.gsfc.nasa.gov/SEsearch/SEdata.php?Ecl=20190702). I would imagine Jean Meeus's _Astronomical Algorithms_ book would have info on using Besselian elements to calculate eclipse circumstances; unfortunately my copy is at work and not to hand  
> **username_4**: I think this question was incorrectly closed, the question is quite clear, and an example implementation is available here: https://www.celestialprogramming.com/MeeusEclipseExamples/example02.html .  Results are in the JavaScript console, view the source for the equations, it is from Meeus' "Elements of Solar Eclipses".  

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## 0 answers

