What's on the Hermetic Systems Website
| Text Analysis Software | Encryption and Security | Calendar Software | ||
| Calendar Studies | Computational Science | C Programming | ||
This website provides Windows desktop software and many articles about calendar systems and other subjects. Listed below are partial contents of the main sections (click on the section headings to see the full contents of each).
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Text Analysis Software
- Hermetic Word Frequency Counter
Scans a text file or a Word docx file and counts the occurrences of different words. The words found can be displayed alphabetically or by frequency. - Hermetic Word Frequency Counter Advanced Version
Scans one or more docx, text or text‑like files (e.g. HTML and XML files) and counts the occurrences of different words or phrases (optionally with pattern matching). - Search KWIC Concordance
A program to scan a text file or an MS Word docx file to generate a KWIC (keywords‑in‑context) concordance which can then be searched for specified words or word patterns. - Hermetic MultiFile Search
For indexing docx files, text files, HTML files, XML files or files of a similar type in multiple folders and their subfolders to allow subsequent rapid searching of those files.
Encryption and Security
- Cryptosystem ME6
An encryption program which uses a symmetric key encryption algorithm (with 500‑bit keys) to encrypt information in files for secure storage or transmission. - Email Encryption End‑to‑End
A program for sending and receiving encrypted email messages (optionally with attached file). It uses a symmetric key method and works with any email program. Bilingual, English/German. - Data Destroyer
A program to wipe single or multiple files, that is, to overwrite their contents so that the data in them cannot be recovered. - File Backup Lite
An easy‑to‑use program to back up new and modified files in selected folders and subfolders.
Calendar Studies
- Types of Calendar
Lunar, solar, lunisolar, rule‑based, etc. - The Julian and the Gregorian Calendars
The Julian Calendar, the Gregorian reform and its adoption, astronomical year numbering, the Julian and the Gregorian Proleptic Calendars, and the accuracy of calendars. - Calendar of the Ancient Kazakh Nomads
A tropical calendar consisting of 13 or 14 sidereal months, based on the Moon and the Pleiades. - The ISO 8601 Date Format
A note concerning date formats, especially the ISO 8601 date format. - Julian Day Numbers
The nature and origin of the Julian day number system. - Chronological Julian Date
An explanation of the concept with examples of use. - The Structure of the Chinese Calendar
How the Chinese Calendar depends on the times of astronomical events. - Two Integral-Week Solar Calendars
Two solar calendars in which years have an integral number of 5-day weeks or 6-day weeks. - The Hermetic Leap Week Calendar
A calendar with an integral number of 7‑day weeks in each year, and which stays in sync with the seasonal year. - The Hermetic Lunar Week Calendar
A solilunar calendar which avoids the problem of rescheduling with each new year. - The Archetypes Calendar
An accurate lunar calendar with (mostly) weeks of 10 days. - Why Seven Days in a Week?
Why not six or eight? - The Maya Calendar
Links to an explanation of Maya and European Dates, the correlation problem, and the yearbearer systems. - The Liberalia Triday Calendar
- The Meyer‑Palmen Solilunar Calendar
- Calendar Quiz
Test your knowledge of calendars. - Writings by Others
Articles by renowned calendrical scientists Karl Palmen, Simon Cassidy, Duncan Steel, Lance Latham, the Böhm brothers and others.
Calendar Software
- Easy Date Converter
A conversion program which gives you the day of the week for a date, the Julian day number and more, and allows date arithmetic: adding a number of days to a date, etc., with or without inclusion of weekend days. In English and German. - The Kazakh Nomad Calendar
Software for converting between dates in the Kazakh Nomad Calendar and dates in the Gregorian Calendar. - Chinese Calendrics
Software for converting between Chinese and Western dates and for obtaining other information such as the dates of Chinese New Year's Day for any year. - Lunar Calendars and Eclipse Finder
Software for conversion among dates in the Common Era and Julian Calendars and dates in several lunar calendars. The program also finds the dates, times and durations of solar and lunar eclipses. - Equinoxes, Solstices and Cross‑Quarter Days
For calculating accurate dates and times of equinoxes, solstices and the Celtic cross‑quarter days for any year in the range 1 CE through 3000 CE (for both hemispheres). - Julian‑Gregorian‑Dee Date Calculator
Converts between Julian, Gregorian, Dee and Dee‑Cecil calendar dates in various formats, and adds and subtracts a number of days, weeks, months and years to or from a given date. - Mayan Calendrics
Converts among Maya and European dates in various calendar systems. - Printable Calendar
A modest utility to help you keep track of things to do. - The Hermetic Leap Week Calendar in Year‑Month‑Day Form
An online display of each month in any selected year (2007‑2040) in the Hermetic Leap Week Calendar