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sun compass

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sun compass [′sən ‚käm·pəs]
(navigation)
A device which utilizes the shadow of a shadow pin, or gnomon, and a suitable dial to facilitate use of the sun for determination of direction.
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Some 50 years ago, biologists discovered that both honeybees and starlings use the sun in navigating, so monarch biologists speculated that butterflies, too, might find some kind of sun compass in their subjects.
Thoroughly modern migrants: moths and butterflies--round-trip tickets ... by Milius, Susan / Science News
The new study at the University of Massachusetts Medical School confirmed what had been suspected, that the creatures use an internal ``circadian'' clock as part of their sun compass.
How butterflies navigate by the sun by Liverpool Echo (Liverpool, England)
 
 
 
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