A month is roughly 1/12 the orbital period of the Terran system around the Sun. It is also an entirely useless construct of the inhabitants of Terra'.
28 days
It is impossible to say when it will explode. It seems very unstable and many astronomers think it may be soon. But soon in astronomical terms could be a million years from now, or it could happen next week.
1 AU (astronomical unit) is the average distance between Earth and Sun. This is about 150 million kilometers.
That cannot be answered unless the velocity is known.
Astronomical is an adjective that has a couple meanings. The first meaning of astronomical is relating to astronomy, and the second meaning of astronomical is extremely large.
synchronous rotation
28 days
28 days
A single Astronomical Unit (AU) is exactly 149,600,000 kilometres.
1 AU is approximately 8 light minutes.
A calendar month in legal terms is around 30 days. This is important to have a standard month for many different types of law.
To facilitate working with astronomical distances in terms of reasonably manageable numbers.
Large mass (in astronomical terms) bend and distort the fabric of spacetime.
You can look in the newspapers, some papers have a monthly column on astronomical events. Or you can look in an almanac such as Whitaker's Almanac. These tell you where the different planets are from month to month.
Months are a human construction with no astronomical basis. There are no months on the planet Mars. The Martian day is slightly longer than an Earth day (24:39 as opposed to 24:00 [hours:minutes])
almanac.
There is no month long holiday in Islam. Even the month of Ramadan, that is the month of fasting, it is a working month and a month long holiday.