Jewish calendar app
Michoel Reach, 12/06/2018 (29 Cheshvan 5779)
This app is designed to teach the full process of calculating the Jewish calendar for a full year, starting with the number of the year.
To use it, download the zip folder, check for viruses, and unzip. Along with supporting files, the folder contains three PowerPoint presentations/pdfs and three html pages.
The main presentation is This year's calendar. It walks through the process of creating a calendar in detail, from beginning to end.
The three html pages are tools to aid that presentation. One is Calculator, for calculating the molad. The second is Keviyus.htm, which is a web page equivalent of the 14 keviyuyos chart in the Tur, Orach Chaim 428. It shows every detail of the 14 different Jewish calendars, along with some convenient aids to visualization. The third is Four Gates.htm, a rendering of the arba'ah sh'arim also described in the Tur.
The second presentation is The keviyus page, which describes some of the features of the Keviyus page. The third presentation is Sidros, which gives more detail on the process of assigned the weekly Torah readings.