The Hebrew month Adar is the same in all countries. It is a Spring month.
The Hebrew calendar is used in Israel, and by Jews all over the world.
The Hebrew calendar has all the information you need.
It depends on how you use the word. For example: Spring (season) = aviv (אביב) spring (metal coil) = sleel (סליל) spring (water source) = ma'yan (מעיין) spring (verb, to jump) = kafats (קפץ)
Ordinary time are all the Sundays in the liturgical calendar when the Church is not observing a major season such as Advent, Christmas, Lent or Easter. In other words, they are 'ordinary' Sundays.
The Chinese developed the Chinese calendar and the Egyptian calendar, while the Hebrews developed the Hebrew calendar. These calendars were developed based on the cycles of the moon and the sun and were used for tracking time, religious observances, and agricultural purposes.
April, June, November and September all have 30 days in them.
Some calendar makers highlight all Sundays, and Veterans' Day in the U. S. fell on a Sunday this year.
Of all April 1sts,... 14.5% are Sundays. 14.25% are Mondays. 14.25% are Tuesdays. 14.5% are Wednesday. 14% are Thursdays. 14.5% are Fridays. 14% are Saturdays.
The ISO calendar is primarily a fiscal calendar and does not change the names of the days of the week, although it does number them differently, starting with 1 on Monday and ending with 7 on Sunday, however Monday on the ISO calendar is also the same Monday on the Gregorian calendar (day 2) and the same Monday that is on the Jewish calendar. Shabbot (or Saturday) does not change. It is still on the same day. But all that is really not relevant, as the keeping of Shabbot is based on the command in the Torah which is based on the Hebrew calendar. So it would not matter what calendar was in use by any country, even if it did mess with the definition of the week, the Hebrew calendar remains the same.
April & July for all year and Jan and Oct for non leap years
Yes. All librarys are closed on Sundays.