I was watching Google map. Saw a line which is joinging north to south pole. It is going between middle of China and Mexico. But, the line is not straight. Tried to search in net but not able to get anything. Can anyone check and let me know https://www.google.com/maps/@-19.6123649,-178.5132229,3z or http://pichost.org/image/UJKHD
I think you're referring to the International Dateline: https://en.wikipedia.org/wiki/International_Date_Line. If so, no, it isn't straight; there are a few irregularities that have been put in place for various political reasons.