predicting lunar eclipses with the HP Prime

03042016, 10:19 PM
Post: #1




predicting lunar eclipses with the HP Prime
This program predicts the local circumstances of lunar eclipses. The user provides an initial calendar date and a search duration. The geographic coordinates of a user's location are also required in order to compute the topocentric coordinates of the moon at the beginning and end of an eclipse.
The following is the output for an example "hardwired" in the code. The companion zip archive includes a PDF document that describes the algorithm implemented in this software. LOCAL CIRCUMSTANCES OF LUNAR ECLIPSES total lunar eclipse begin penumbral phase of lunar eclipse calendar date Jan 21, 2000 UTC time 2 hr 4 min 40.512 sec julian date 2451564.58658 lunar azimuth angle 83.3338317769 degrees lunar elevation angle 23.0744073644 degrees greatest eclipse conditions calendar date Jan 21, 2000 UTC time 4 hr 45 min 15.84 sec julian date 2451564.6981 lunar azimuth angle 111.829817885 degrees lunar elevation angle 52.4267167333 degrees end penumbral phase of lunar eclipse calendar date Jan 21, 2000 UTC time 7 hr 25 min 57.216 sec julian date 2451564.80969 lunar azimuth angle 185.880353341 degrees lunar elevation angle 69.4308063637 degrees event duration 5.35464 hours 

01052016, 07:57 PM
Post: #2




RE: predicting lunar eclipses with the HP Prime
The attached zip file contains an updated and more accurate lunar eclipse program for the HP Prime. It will take some time to run. It consists of almost 3000 lines of comments and source code.


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