Why are moths attracted to lights ? पतंगें रोशनी की ओर क्यों आकर्षित होती हैं?

 Why are moths attracted to lights ?

Over the millennia, moths navigated at night by the light of the moon. To fly in a given direction, they would keep the moon in a fixed location, relative to their bodies. For example, to fly north, they would keep the rising moon over their right shoulder. However, a porch light, for example, is brighter than the moon for a moth flying nearby so he confuses the moon. Unfortunately, keeping the a little bit past, the light is behind him. So he turns to get the light opposite his shoulder again. And ends up spiralling into the light with every correction he makes. That's the theory.

But, as anyone who watches moths around porch lights knows, not all moths spiral in. Many, many moths fly directly at the light source with little indication of any spiral.

Some nights-flying moths migrate using the moon as a primary reference and calibrate that reference with their internal geomagnetic compass. Every hour they alter their flight path by 16 degrees to correct for the travel of the moon across the sky (the Earth's rotation). On moonless nights they navigate solely with the geomagnetic compass. 
  

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