what is the difference of time between the longitude of india and chicago

how many time zones in between?

That's the number of hours.

Or, if you know the longitudes, since there are 24 hours in a 360° circle, each hour covers about 15°

http://www.worldtimezone.com/

To find the time difference between two locations given their longitudes, you need to know the specific time zones they fall under.

India generally falls under the Indian Standard Time (IST) zone, which is UTC +5:30. However, please note that India also observes daylight saving time in some regions, which may shift the time difference during specific periods.

Chicago, on the other hand, falls under the Central Standard Time (CST) zone, which is usually UTC -6:00. Similarly, Chicago also observes daylight saving time, which may affect the time difference during certain periods.

To calculate the time difference between India and Chicago, we need to consider the offset between their respective time zones.

India (IST) is ahead of Coordinated Universal Time (UTC) by 5 hours and 30 minutes, while Chicago (CST) is behind UTC by 6 hours.

So, to find the time difference between India and Chicago:

1. Determine the current UTC time.
2. Add the offset for India (IST) - in this case, +5 hours and 30 minutes - to the UTC time. This gives you the current time in India.
3. Subtract the offset for Chicago (CST) - in this case, -6 hours - from the UTC time. This gives you the current time in Chicago.
4. Finally, calculate the time difference between the two locations.

Please note that depending on the time of year, daylight saving time adjustments may affect the time difference between India and Chicago.