Some questions about Rahukal and related topics

[Sarjil200]

Hello,
In the links below, which ones are serious like Rahu kalam?
http://www.astroccult.net/chaughadia_muhurats.html
https://secure.wikimedia.org/wikipedia/en/wiki/Muhurta
http://www.indianhindunames.com/rahu_ya ... kaalam.htm
http://www.astroloka.com/rahukaal.aspx


Where can I get the meanings/translations of these Mantras / Spells of the 9 planets?
http://hubpages.com/hub/Navagraha-Mantra

[Slightly off-topic]
Also, I once read that MAru the god of death is at diferent directions at different days (Sunday -> North, Tuesday -> West, etc.). Any idea about this

[Sarjil200]

Do these meanthe same thing :
Kuligai kalam
Gulika kalam

[Sarjil200]

I read that Rahukal is very dangerous. But what about Yamaghantam, Vishaghati?