To Maintain Validity of Astronomical Calculations
To Maintain Validity of Astronomical Calculations

To Maintain Validity of Astronomical Calculations
38. If one gets confident regarding the birth of the new moon and the fact that it can be seen with naked eye through astronomical calculations, can one rely on it in determining the first of Ramadan/ Shawwāl? Especially if it is said by the expert in the related field.
A: The mere confidence in astronomical calculations has no effect. However, one should act upon his knowledge and confidence in the existence of the crescent which can be sighted.
Source: Hadana adopted from the Istiftaat of the Grand Ayatollah Khamenei