Lagna decides the 1st house and lagna specifically is a point or say a degree in a chart. It's neither a planet or a node, nothing. Just a point. Now having lagna at 5 degree dhanu and having lagna at 20 degree dhanu are all the same?
We don't assign a nak to lagna too. Then what is the use of lagna? Apart from determining the houses.
And please enlighten if lagna like planets can be combust by sun?
Will be grateful to learn.

Regards