Why are Rahu and Ketu Called shadow planets?
A source of light reflecting on a subtle body without mass cannot create a shadow, kindly reflect on this,. The answer is pretty simple, it is the characteristic of Rahu and Ketu to reflect the nature of the planet they are with, in other words casting a shadow of that planet . Point number 2 since they are said to be the lunar nodes the very basic nature of moon is reflective, it reflects the light received from the sun, in a similar way here Shadow means creating an impression of the associated planet so Rahu and Ketu represent the shadow of associated planets.
