11. Based on astronomical calculations and observations, " the moon has passed the conjunction point," 12. Gou derived a cubic interpolation formula for his astronomical calculations . 13. However, according to modern astronomical calculations this eclipse was not visible from Mecca or Medina. 14. Here the largest source of error in the date was the uncertainty of 16th-century astronomical calculations . 15. She assisted him with mathematical and astronomical calculations . 16. The difficulty here is that the Jewish calendar was based not on astronomical calculation but on observation. 17. This could be used for astronomical calculations such as solar and planetary longitudes and could predict eclipses. 18. Astronomical calculations show that 65?N summer insolation should increase gradually over the next 25, 000 years.19. The Astronomical Computing Bureau, Columbia University, performed astronomical calculations representing the state of the art in computing. 20. Kane and his officers also established a scientific station to observe climatic conditions and to make astronomical calculations .
