## Important sources
 - How to build a package is at http://python-packaging.readthedocs.org/en/latest/index.html

## Calendar sources
 - Lots of detail about calendar conversion is at http://norbyhus.dk/calendar.php
 - A mistake in Wolfram Alpha (and a good test case) http://mathematica.stackexchange.com/questions/97818/why-does-mathematicas-date-for-the-battle-agincourt-differ-from-the-us-navys
 - This page has lots of information about conversion algorithms: https://en.wikipedia.org/wiki/Julian_day

## Interesting calendars
 - Swedish historical calendar
 - Alaskan historical calendar
 - French revolutionary calendar
 - Julian day numbers

## Recurrent events
 - Easter
 - Thanksgiving
 - Rosh Hashanah
 - Hannukah

## Daily observations
 - Soviet five-day work week
 - Phases of the moon

## 'Day collections'
 For example, the set of public holidays in the UK is a day collection. It isn't a single recurrent event, but we can check if any day is in the collection, or count the number of such days between any two dates.


## Important sources
 - How to build a package is at http://python-packaging.readthedocs.org/en/latest/index.html

## Calendar sources
 - Lots of detail about calendar conversion is at http://norbyhus.dk/calendar.php
 - A mistake in Wolfram Alpha (and a good test case) http://mathematica.stackexchange.com/questions/97818/why-does-mathematicas-date-for-the-battle-agincourt-differ-from-the-us-navys
 - This page has lots of information about conversion algorithms: https://en.wikipedia.org/wiki/Julian_day

## Interesting calendars
 - Swedish historical calendar
 - Alaskan historical calendar
 - French revolutionary calendar
 - Julian day numbers

## Recurrent events
 - Easter
 - Thanksgiving
 - Rosh Hashanah
 - Hannukah
 - Leap days

## Daily observations
 - Soviet five-day work week
 - Phases of the moon

## 'Day collections'
 For example, the set of public holidays in the UK is a day collection. It isn't a single recurrent event, but we can check if any day is in the collection, or count the number of such days between any two dates.


Add leap days to the list of recurrent events.
Add leap days to the list of recurrent events.
