Islamic Months & Virtuous Occasions

Sighting the moon with a telescope

Q:

1) Kindly explain why Shari'at would allow the aid of spectacles to sight the moon but not the aid of a stronger medium like a pair of binoculars?

2) Kindly explain why the sighting of the moon from the Mount Everest at 8.8 km above sea level would be acceptable but not from an aircraft flying at a lower altitude of 5 km above sea level?