A ship is in longitude 54°00'W on a true course of 090°. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?

Question

A ship is in longitude 54&deg;00'W on a true course of 090&deg;. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?

Accepted Answer

Option A: 52&deg;30'W. Standard time zones are centered on meridians that are multiples of 15 degrees, extending 7.5 degrees on either side. At 54¼ircW, the zone meridian is 60¼ircW. Advancing east on course 090¼irc, the boundary to change clocks is reached at 52¼irc30'W.

A ship is in longitude 54&deg;00'W on a true course of 090&deg;. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?

A ship is in longitude 54°00'W on a true course of 090°. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?