Solpage is a software program used to compute planetary positions, angles and alignments for a given date or time-frame. In order to accurately compute the positions of the planets Solpage uses the periodic terms as provided by the VSOP87 solution.
Development of the program started in early 2016. Initially only the alignment computation engine was developed. This engine computes the exact time when two celestial bodies reach the same longitude relative to a third celestial body. Throughout 2016 this engine was corrected and optimized to handle 8 decimal digits precision.
In October of the same year the listing of positions and angles for a given time and centric view was added.
In November, while the program was completely being rewritten*, new features were added, the most important of which is the possibility to scan for specific angles in a given time-frame.
click an image to enlarge
The software is primarily used for earthquake forecasting based on evidence gathered by several people in recent decades that large earthquakes tend to occur when planets align.
While most software doing planetary computations is limited to heliocentric and geocentric positions, Solpage is one of the very few programs that compute other planetary centric positions and alignments as well. It is the very reason why the Solpage project was started.
As an example we ask Solpage when Jupiter, Uranus and Neptune will be in exact alignments between 1 January 2000 and 31 December 2200. Doing a Jupitercentric search, the program finds one match:
2167-02-08, 22:03:59 301°21'55"
So according to Solpage the next time Uranus and Neptune are aligned as seen from Jupiter is on 8 February 2167 at 22:03:59 UTC, when the longitude of both planets is 301°21'55". Below is a screenshot taken from Solar System Scope depicting the planetary positions on 8 February 2167 at 22:03 with the alignment marked by the yellow line.
A rare alignment of the gas giants Jupiter, Uranus and Neptune on 8 February 2167
The computation for the above example was done using a 32bit Pentium 3 GHz E5700 Dual-core processor. It took Solpage 9 seconds to scan 200 years and display the result.
* Update: In November of 2016 further optimizations to the program brought down the scan time of the test to 5 seconds.
Ditrianum is the sole owner and developer of the Solpage program. It is currently not available or for sale.