You are describing how the ancient Jewish calendar new moons were calculated. As I have explained to you in post #58 the modern Jewish calendar you use was created by Hillel II in 359 AD and uses a mathematical calculation rather than visually sighted new moon calculations. Here is a quote from a site that explains your modern Jewish calendar:
"In the fourth century, Hillel II established a fixed calendar based on mathematical and astronomical calculations. This calendar, still in use, standardised the length of months and the addition of months over the course of a 19 year cycle, so that the lunar calendar realigns with the solar years."
http://www.jewfaq.org/calendar.htm