1. CALENDARS The Creation of the Calendar

2. THE LUNAR CALENDAR The first calendar that was used was the lunar calendar. The first calendar that was used was the lunar calendar. The word “month” is derived from the word mona, which means “moon”. The word “month” is derived from the word mona, which means “moon”. The lunar calendar was useful, but it had shortcomings because of its differences with the solar year. The lunar calendar was useful, but it had shortcomings because of its differences with the solar year. Twelve lunar months is approximately 354 days which is about 11 days shorter than the true solar year, and 13 lunar months is about 383 and ½ days, which is 18 and ½ days longer than the solar year. Twelve lunar months is approximately 354 days which is about 11 days shorter than the true solar year, and 13 lunar months is about 383 and ½ days, which is 18 and ½ days longer than the solar year.

3. LUNAR CALENDER

4. SOLAR CALENDAR Then astronomers felt like the sun provided a more accurate measurement. Then astronomers felt like the sun provided a more accurate measurement. The astronomers of Kemet were the first to develop a solar calendar which divided the year into 365 days, consisting of 12 months of 30 days each. The astronomers of Kemet were the first to develop a solar calendar which divided the year into 365 days, consisting of 12 months of 30 days each. The solar day and the changing of seasons of the year gave rise to the development of this calendar based on the solar year. The solar day and the changing of seasons of the year gave rise to the development of this calendar based on the solar year. The solar year is defined as the time it takes the planet Earth to make one complete revolution around the sun, which is a period of exactly 365 days, 5 hours, 48 minutes, and 46 seconds. The solar year is defined as the time it takes the planet Earth to make one complete revolution around the sun, which is a period of exactly 365 days, 5 hours, 48 minutes, and 46 seconds. Five additional days were added to the end of the year, which corresponded to the birth of the Gods, Osiris, Isis, Horus, Set and Nephthys. Five additional days were added to the end of the year, which corresponded to the birth of the Gods, Osiris, Isis, Horus, Set and Nephthys.

5. PICTURE OF SOLAR CALENDER

6. The year was divided into 3 seasons of four months duration, which were called the inundation, the cultivation, and the harvest. The year was divided into 3 seasons of four months duration, which were called the inundation, the cultivation, and the harvest. Each 30-day month was divided into 3 weeks of 10 days, and each day was then divided into 24 hours. Each 30-day month was divided into 3 weeks of 10 days, and each day was then divided into 24 hours. The word hour derived from the God named Horus, who was associated with the sun. The word hour derived from the God named Horus, who was associated with the sun. The hour of the day represents the position of the sun. The hour of the day represents the position of the sun. The Kemites realized that their civil calendar was imperfect because it lacked a quarter of day each year relative to its sidereal orbit- the exact period in which the earth makes one complete revolution around the sun. The Kemites realized that their civil calendar was imperfect because it lacked a quarter of day each year relative to its sidereal orbit- the exact period in which the earth makes one complete revolution around the sun. A more precise sidereal calendar was introduced around 4236 B.C.E. A more precise sidereal calendar was introduced around 4236 B.C.E. The new calendar added one day every four years (leap year) by adding a new year every 1,460 years. The new calendar added one day every four years (leap year) by adding a new year every 1,460 years.

7. ROMAN CALENDAR Introduced around 738 B.C.E. Introduced around 738 B.C.E. Consisted of 10 months and a year of 304 days. Consisted of 10 months and a year of 304 days. Names of months- Martius, Aptilis, Maius, Janius, Quintilis, Sextilis, September, October, November, December. Names of months- Martius, Aptilis, Maius, Janius, Quintilis, Sextilis, September, October, November, December. In 452 B.C.E., the Emperor Numa added the month January to the beginning of the year and February to the end of the year. In 452 B.C.E., the Emperor Numa added the month January to the beginning of the year and February to the end of the year. Numa then created a new month called Mercedinus which had 22 or 23 days, and inserted it between February 23 and 2 every other year. Numa then created a new month called Mercedinus which had 22 or 23 days, and inserted it between February 23 and 2 every other year. This caused the Roman year to shift three months ahead of the seasons, thereby causing autumn to appear in July and winter in September. This caused the Roman year to shift three months ahead of the seasons, thereby causing autumn to appear in July and winter in September.

8. JULIAN CALENDER Consisted of 365 and ¼ days. Consisted of 365 and ¼ days. Divided into 12 months of 30 and 31 days, which had 29 days and 30 days every four years. Divided into 12 months of 30 and 31 days, which had 29 days and 30 days every four years. Renamed Quintilis after Julius Caeser and called it July. Renamed Quintilis after Julius Caeser and called it July. Renamed Sextilis to August after the new emperor Augustus. Renamed Sextilis to August after the new emperor Augustus. Augustus took a day out of July and put it in August in order to make his month as long as Julius Caeser’s. Augustus took a day out of July and put it in August in order to make his month as long as Julius Caeser’s. Remained in use for over 1,500 years, but because it was actually 11 minutes and 14 seconds longer than the solar year, it eventually led to a shifting of the dates of the seasons; and by the year 1580 A.C.E, the spring equinox fell on March 11, instead of March 21. Remained in use for over 1,500 years, but because it was actually 11 minutes and 14 seconds longer than the solar year, it eventually led to a shifting of the dates of the seasons; and by the year 1580 A.C.E, the spring equinox fell on March 11, instead of March 21.

9. GREGORIAN CALENDAR Supposed to be based on the year that Jesus the Christ was born. Supposed to be based on the year that Jesus the Christ was born. Corrected the difference between the sun and calendar by deleting ten days from the month of October. Corrected the difference between the sun and calendar by deleting ten days from the month of October. This calendar is based on the tropical year of 365.2425 days and is so accurate that the difference between the calendar and solar years is now only approximately 26 seconds. This calendar is based on the tropical year of 365.2425 days and is so accurate that the difference between the calendar and solar years is now only approximately 26 seconds.

10. OTHER CALENDARS CURRENTLY IN USE WORLDWIDE The Hebrew Calendar Said to have begun with the Creation 3,760 years and 3 months before the beginning of the Christian era. Based on the moon and consist of 12 months that alternately 30 and 29 days long. The Islamic Calendar Begins with Muhammad’s flight from Mecca to Medina, which occurred in 622 A.C.E., by the Greogorian calendar. Lunar calendar which has 12 months, alternately 30 and 29 days in length. The Islamic year has 354 days, and divides time into cycles of 30 years long. As accurate as the Gregorian calendar.