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I am owner of the sphere, Of the seven stars and the solar year, Of Caesar's hand, and Plato's brain, Of Lord Christ's heart, and Shakspeare's strain.
The Jalali calendar working according to the solar year gives an error of one day in 5,000 years, while today's civil Gregorian calendar gives an error of one day in 3,330 years.
Usually, the birth anniversary of Allah Almighty's last Messenger is observed on every 12th of Rabiul Awwal (Lunar Calendar), the third month of Islamic calendar year, but the Eidgah shrine has also the honour to celebrate the day as per the solar year.
The Gregorian calendar, used by most of the world, also doesn't match up exactly with a solar year. Because of this, there are leap days about 24 times a century, according to the Atlantic.
Baisakhi is an ancient harvest festival which marks the beginning of a new solar year and harvest season.
The Diwali is usually celebrated in the month of October or November, which is the last day of the solar year followed by the Hindus.
The lunar year is about 11 days shorter than the solar year.
More than 740 people have been detained in connection with trafficking narcotics in capital Kabul and provinces the last solar year that ended on March 21, the Criminal Justice Task Force (CJTF) has said.
Celebrating Christmas on January 7 dates back to 1582 when astronomy scientists during the Roman pope Gregory XIII's era noticed a mistake in calculating the length of the Greek solar year. It was believed that the Greek solar year lasted for 365 days, and six hours, according to the Julian calendar, meaning that Christmas celebrations should take place on December 25.
I assume that the visit will take place early in the coming solar year [Iranian calendar year starting March 21, 2018]," ISNA news agency quoted Foreign Ministry spokesman Bahram Qasemi as saying during a press conference in Teharan on Monday.

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