The Borana Oromo Calendar and Namoratunga. 🇪🇹🇰🇪(1). The #Borana_Oromo people of Ethiopia invented a calendar system that dates as old as when Greece invented the Athenian calendar (an ancient calendar also known as the Attic Calendar). Unlike the Athenian calendar, the Borana calendar has survived 2,300 years.(2). The Oromo people of the Borana grouping are situated within the southern part of Ethiopia and the Northern part of Kenya (within the border), and also some parts of Somalia.(3). The Borana Oromo calendrical system has been in existence since 300 BC and relies on astronomical observations of the moon and stars. The lunar-stellar calendrical system does not use solar (sun) observation at all, as the area is situated close to the equator. This means that there is little or no change in the behavior of the sun throughout the year.(4). A year under the Borana calendar is made of 354 days making it 10 – 11 days shorter than the solar one. Twelve synodic months make up a year, and each month is made up of 29.5 days. The calendar uses the conjunction of seven stars (Beta Triangulum, Pleiades, Aldebaran, Bellatrix, Central Orion, Saiph, and Sirius) in different lunar phases to determine the days.(5). #Ayantu is the name given to the timekeepers of the tribe who watch the phase of the moon and determine the days and beginning of each month. The months are identified by the ayantu who notice a unique astronomical development that occurs once a year. The length of the month is measured by the time the moon takes to go through all the phases completely.(6). The Borana Calendar does not offer weeks but each day has a name. There are only 27 names available, so for the 28th, 29th, and or 30th day, the name is recycled, and the first two or three names are used for the last two or three days. This means that each month starts with a different name and there is no fixed name for a day. The Borana Ayantu will determine if the month will run into 29 or 30 day