--- title: Time zones and the calendar — a lesson of Mova's school · trees and pragmatics description: «Time zones and the calendar», a lesson of the world course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Because the Earth turns, noon comes to different places at different times: when it is noon in London, it is already evening in China and still --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [World](https://md.mova.elamur.ai/free/en/corpora/school/world/) / Time zones and the calendar # Time zones and the calendar Lesson 9 of the world course of Mova's primary school: 18 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/world/9-time-zones-and-the-calendar/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/0/) — Because the Earth turns, noon comes to different places at different times: when it is noon in London, it is already evening in China and still early morning in New York. - [1](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/1/) — So the world is divided into time zones, roughly 24 of them, one for each hour of the Earth's turn; going east, the clocks are usually one hour later in each new zone. - [2](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/2/) — Our calendar follows the sky: a day is one turn of the Earth, a month comes from the Moon's phases, and a year is one trip of the Earth around the Sun. - [3](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/3/) — A year is not exactly 365 days but about 365 days and 6 hours, so every four years the four extra quarter days add up to one whole day, and we add 29 February: that is a leap year. - [4](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/4/) — Without leap years the calendar would slip by about one day every four years, and after about 750 years the summer months would fall in the middle of winter. - [5](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/5/) — Because the Earth turns, it is noon at different times in different places. - [6](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/6/) — The world is divided into time zones. - [7](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/7/) — Going east, the clock usually moves one hour later in each new time zone. - [8](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/8/) — There are 24 hours in a day, so there are roughly 24 main time zones. - [9](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/9/) — The Sun rises earlier in places farther east. - [10](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/10/) — China and Japan lie far to the east of Ukraine and France, and New York lies far to the west of London, across the ocean. - [11](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/11/) — A year is about 365 days and 6 hours long. - [12](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/12/) — A leap year has 366 days, with an extra day on 29 February. - [13](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/13/) — Most years divisible by 4 are leap years, such as 2024 and 2028. - [14](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/14/) — Years ending in 00 are leap years only if they divide by 400, so 2000 was a leap year but 1900 was not. - [15](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/15/) — A month comes from the Moon, which goes from full moon to full moon in about 29 and a half days. - [16](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/16/) — A day comes from one turn of the Earth, and a year from one trip around the Sun. - [17](https://md.mova.elamur.ai/free/en/corpora/school/world/9-time-zones-and-the-calendar/17/) — Without leap years, the seasons would slowly move to different months. - ← previous: [Eclipses](https://md.mova.elamur.ai/free/en/corpora/school/world/8-eclipses/) - next →: [Thinking like an astronomer](https://md.mova.elamur.ai/free/en/corpora/school/world/10-reasoning-about-space/) - ↑ back to [World](https://md.mova.elamur.ai/free/en/corpora/school/world/)