Tagged: Calendars

The problem of knowing when a lunar year begins and ends - Out of Space

Duncan Steel Jun 05, 2019

The Islamic fast of Ramadan has come to an end, marking the beginning of the tenth month of the religion’s twelve-lunation year and therefore Eid al-Fidr, the ‘Festival of Breaking the Fast’. How the decision is made when each of those months begins and ends depends upon the actual sighting of the crescent new moon in the sky, a highly-complicated … Read More

Does Earth have a natural prime meridian? - Out of Space

Duncan Steel Mar 20, 2019

We are generally habituated to using the Greenwich meridian as the global standard for mapping and time-keeping, despite it being only 135 years since its adoption. As I show here, if the Catholic Church had adopted in 1582 a more-precise calendar in terms of year length then a natural prime meridian results, in a location that might appear surprising. Read More

And so this is Christmas… - Out of Space

Duncan Steel Dec 19, 2018

The date of Christmas is a matter many find confusing, and yet the adopted anniversary is easy to understand if you follow through the history, astronomy and human biology that are involved.  Why is the Nativity commemorated on December 25th, when it is clear Jesus was not actually born on that date? And how can a year be termed “Before … Read More