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Your question interested because as dumb as I feel, I didn't know that there was half hour time zones, so I researched it and found out why. The only way for me to explain it is to explain the purpose of time zones in the first place, and by the way I found out they are called "offset time zones" and they can be thirty minutes or even fifteen minutes. There is twenty four time zones in the world which are based on the fifteen degree increments of longitude. This is because the earth takes twenty four hours to rotate and there are 360 degrees of longitude so 360 divided by 24 equals 15. So the sun moves across 15 degrees of longitude in an hour. The offset time zones were designed to better coordinate noon as the point in the day when the sun is at its highest point in the sky, which is what our time zones revolve around... I hope this answers your question!

Reference

About.com: Geography - Offset Time Zones. http:/geography.about.com/od/culturalgeography/a/offsettimezones.htm.

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โˆ™ 15y ago
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โˆ™ 5mo ago

Half-hour time zones exist to account for regions that are not large enough to warrant a full one-hour difference but still have significant solar time variations. This helps maintain more accurate timekeeping in these areas relative to their solar noon.

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Q: Why are there half hour time zones?
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Related questions

What time increment do you use to count Time Zones?

Usually an hour, though in some places it can be half an hour.


Why are there 39 time zones?

There are 39 time zones because the Earth is divided into 24 longitudinal sections, each representing one hour of time difference. However, some regions choose to use a half-hour or quarter-hour offset from neighboring time zones, leading to 39 distinct time zones worldwide.


What is the time different between each time zone?

Generally there is one hour between time zones. However, in certain places this is reduced to half an hour


Are there 26 time zones?

There are 24 time zones in the world, each representing a one-hour difference in time. However, some regions use half-hour or 45-minute offsets from this standard, resulting in more than 24 distinct time zones.


What is a zoning map?

It is a map showing the time zones in different parts of the world, usually when it is midday in Greenwich, from where the time zones are measured from. Most of the map is done in sections of 15°, representing one hour, although there are half hour time zones in some parts of the world.


What are 3 countries in Asia with varying time zones between half an hour?

India, Bhutan, and Myanmar


How many time zones are there between Dublin and Jakarta?

There is a 6 hour time difference. It is actually 7 time zones different, as some time zones are not 1 hour.


How many time zones in world?

There are 24 time zones in the world, each one representing a one-hour difference from the next. This system helps organize the time across the globe based on the Earth's rotation. Some countries and regions may use half-hour or 45-minute differences to align their time zones with their specific geographical position.


How are the time zones divided up?

Time zones are divided based on lines of longitude, with each time zone roughly covering 15 degrees of longitude. There are a total of 24 time zones around the world, each one hour apart from the next, although some countries may use half or quarter-hour offsets from standard time zones. The Prime Meridian (0 degrees longitude) in Greenwich, England is the starting point for the time zone calculations.


How many time zones are there in the west?

there are 24 time zones in the west 1 for each hour


How time zones in a day?

There are 24 times zones in a day, one for each hour.


What 3 countries in Asia have time zones that vary by half an hour?

Here is a list of all of the Asian time zones that are not offset from Coordinated Universal Time (UTC) by multiples of an hour:UTC+3:30/UTC+4:30 : Iran Standard Time/ Iran Daylight Saving Time (IRST/IRDT) in IranUTC+4:30 : Afghanistan Time (AFT) in AfghanistanUTC+5:30 : Indian Standard Time (INST) in India and Sri LankaUTC+5:45 : Nepal Time (NPT) in NepalUTC+6:30 : Myanmar Time (MMT) in MyanmarUTC+8:30 : Pyongyang Time (KPT) in North Korea