What's on the Hermetic Systems Website
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 Search and Count
- 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). - Phrase Frequency Counter Advanced
Scans one or more MS Word DOCX, text or text-like files (e.g. HTML and XML files) and counts the number of occurrences of different phrases. The phrases found can be displayed alphabetically or by frequency, and can be searched for sub-phrases. - 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.
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. - 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. - Prime Factors
Windows software to find prime numbers, pairs of primes, all factors of a given number (and more)
Calendars New and Old
- 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. - The Meyer‑Palmen Solilunar Calendar
A calendar which stays in sync with the solar and lunar cycles and has minimal jitter. - The Archetypes Calendar
An accurate lunar calendar with (mostly) weeks of 10 days. - The Structure of the Chinese Calendar
How the Chinese Calendar depends on the times of astronomical events. - Calendar of the Ancient Kazakh Nomads
A seasonal 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. - 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. - 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
- Calendar Quiz
Test your knowledge of calendars. - Writings by Others
Articles by renowned calendrical scientists Karl Palmen, Simon Cassidy, Duncan Steel, Lance Latham and others.
Calendrical and Astronomical Software
- BCE-BC-AD-CE Converter
Converts between Julian and Gregorian Calendar dates in BCE, BC, AD and CE date formats, and adds and subtracts a number of days, weeks, months and years to or from a given date. - Julian‑Gregorian‑Dee Date Calculator
Converts between Julian, Gregorian, Dee and Dee‑Cecil calendar dates in various formats, does date arithmetic, and calculates vernal equinox dates. - Celtic Festival and Cross-Quarter Dates
A program to find the exact dates and times, and zodiac positions, of full moons and dark moons, lunar Celtic festivals (Imbolc, Beltane, Lughnasadh and Samhain), equinoxes and solstices, and solar cross-quarter days. - Date-Time Calculator
Software to perform conversion, addition and subtraction of dates and times. - Eclipses, Moon Phases and Seasons
Software to find the exact dates and times of six kinds of eclipses, phases of the Moon, solstices, equinoxes and the solar cross-quarter days, over a range of dates. - 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). - 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. - Guide to calendar date conversion software
Find which program (or pair of programs) will convert dates in selected calendars.