With the astronomical solar eclipse occurs and can predict the time until the Lunar Eclipse for a long time in advance. Create a calendar using known artificial zeros used in mathematics.
Capable astronomical You can predict the eclipses and lunar eclipse in advance for a long time. Create a calendar Known for inventing the zero in mathematics.
Have the ability in astronomy. It can predict the solar eclipse eclipse time and advance for a long time, create a calendar. Known invent the zero used in mathematics.