| 11. | All lines of longitude must be crossed.
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| 12. | They followed the line of longitude at 12?West, while Allied convoys to Gibraltar were 20?West.
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| 13. | With a latitude-longitude rectangle, only lines of longitude are great circle arcs; lines of latitude are not.
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| 14. | So does the line of longitude.
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| 15. | They travelled along the line of longitude at 12?West, while Allied convoys to Gibraltar were 20?West.
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| 16. | However, they recognize practical issues associated with the pure use of a line of longitude for this purpose.
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| 17. | On his map, the lines of longitude, instead of converging at the poles, run parallel to each other.
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| 18. | The intention was to follow the 30 degree east line of longitude, which would cover the most land.
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| 19. | If this line of longitude were used strictly, people could simply avoid Shabbat altogether by crossing the street.
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| 20. | These features made it possible to calculate changes in the time as an aviator flew across lines of longitude.
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