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In the International Meridian Conference convened by U.S. President Chester Arthur in 1884 with representatives from 25 countries, the 0° longitude through which place was agreed as the Prime Meridian—the international standard of calculating time?

How is local time measured relative to Greenwich Mean Time (GMT) up to GMT - 12 hours moving westward and up to GMT + 12 hours moving eastward?

What is the Indian Standard Time (IST) setting relative to the Greenwich Meridian—known universally as the Prime Meridian or Central Meridian—though technically IST—with a half-hour offset—is a non-standard time zone?

The longitude of reference for Indian Standard Time—five-and-a-half hours ahead of GMT—at 82°30’ E—calculated as (15*5.5)°—passes through which place in India?

Which international time standard used by computerized systems—defined by the International Telecommunications Union based on International Atomic Time and made possible by the caesium atomic clock invented in 1955—replaced GMT in 1972?

Crossing which meridian—half-way around the globe at 180° longitude, zigzagging through the Bering Strait making a ‘panhandle’ at Kiribati in the mid-Pacific—is a day added while flying from Washington to Tokyo and a day subtracted flying back?

Which time format facilitates maximum daylight time during summer days—due to the sun rising earlier and setting late as compared to winter days—by adding an hour to the local time zone based on the GMT standard and retracting it for winter time?

GMT - 10—the farthest westward from Greenwich Mean Time Zone marked by 7°30’ W to 7°30’ E—is the time zone of which part of the world that lies in the South Pacific Ocean?

GMT + 12—the farthest eastward from Greenwich Mean Time Zone marked by 7°30’ W to 7°30’ E—is the time zone of which part of the world?

Which country—the world’s largest country by area—spans the maximum time zones, nine—Kaliningrad, Moscow, Yekaterinburg, Omsk, Krasnoyarsk, Irkutsk, Yakutsk, Vladivostok and Magadan—of the world’s 24 time zones?