Brief introduction of practical perpetual calendar content

The solar calendar is a calendar based on the movement of the earth around the sun. It takes the earth's orbit around the sun as a year. The length of a tropical year is 365. 2422 days, which is 365 days, 5 hours, 48 minutes and 46 seconds. The cumulative four years is 23 hours 15 minutes and 4 seconds, which is roughly equal to one day, so every four years, 1 day is added, and the end of February is 366 days, which is a leap year. However, four years plus 1 day is actually 44 minutes and 56 seconds longer than the year of the Tropic of Cancer. When the product reaches 128, one more day is calculated, that is, about three more days are calculated in 400 years.

The leap year in the solar calendar stipulates that if the number of years in AD can be divisible by 4, it is considered a leap year. In order to subtract the extra three days in 400 years, and specify the integer of the century A.D., that is, when the number of years A.D. is an integer of 100, leap years will be considered only if they are divisible by 400, for example, 1600. ...

The green practical perpetual calendar is a practical multifunctional calendar with compact structure, no installation and simple and convenient use. The modern high-precision astronomical algorithm is used to calculate the date.

Date range: from 4600 BC to AD 10000, lasting nearly 15000. Including Gregorian calendar, lunar calendar, hijri calendar, historical year number, public and lunar festivals, solar terms, date of birth, China zodiac, constellation, plum blossom, 993 volts, 28 stars, the rise and fall of the sun and the moon, and the contents of the traditional yellow calendar in China. The software integrates some practical tools, such as custom anniversaries (birthdays, etc. ), daily notes, schedule, world time, alarm clock timing reminder, network time correction, weather forecast, TV program forecast, voice time, address book, favorites, bookkeeping and financial management, password box and memo, screen locking, calendar printing, etc. When the software is minimized, it can display the calendar and the time of the day in various small windows.