A more thorough explanation:

A month is a period of time that the calendar is divided into. There are twelve months in a year. Each month has a different name and number of days. For example, March is a month that has 31 days.

Another way to think of a month is as a time period of approximately 30 days. For example, if you are told that something is due one month from today, you have about 30 days to complete it.

At common law, a month was defined as a period of 28 days. This is because it is the time it takes for the moon to complete one revolution. This is also known as a lunar month.

Finally, a month can also refer to one-twelfth of a tropical year. This is the time it takes for the sun to pass through one sign of the zodiac, which is usually around 30 days. This is also known as a solar month.

Examples:

• The month of July has 31 days.
• I have a project due in one month, which means I have about 30 days to complete it.
• A lunar month is approximately 28 days long.
• A solar month is approximately 30 days long.

These examples illustrate the different ways that a month can be defined and measured. They show that a month can be a specific period of time on the calendar, or a more general time period of around 30 days. They also show that a month can be measured in different ways, such as by the moon or the sun.