When to Sight the Moon?

Q: We have a muslim business manager who has decided that Sunday will be Eid. Since when has Allah given this man the authority to decide that Ramadhaan will only be 29 days? We have now been told that we cannot put in leave for Monday we must wait until friday. So I said but they will only do the moonsighting on Saturday and not Friday as Saturday is the 29 day of ramadhaan. 

Taking a second wife without informing the first

Q: Is it permissible for a husband to get into a second marriage without informing his first wife? Even after the second marriage he lied to his first wife and didn't let her know two or three years after the second marriage. Now the wife came to know and is in shock since the first marriage was 17 years old and the first wife was also quite young and a mother of four kids. She now wants her husband to divorce the second wife but husband is not willing. The second nikkah was also not announced in both sides.

Contact Lenses

Q: It has been brought to my attention by a very close friend that there are contact lenses on the market, which if you wear it, your eye color changes, will this be Jaiz cause we are changing something which Allah Ta'ala has given us as a bounty.