Note "is less than a quadrant..." is less than 90° by l/30th of 90° or 3°, and is therefore equal to 87°. 
On the Sizes and Distances of the Sun and the Moon (c. 250 BC)
                                    
“On September 16, 1978, there was an eclipse of the moon in Riyadh. Late one afternoon it became visible: a dark shadow moving slowly across the face of the pale moon in the darkening blue sky. There was a frantic knocking on the door. When I opened it, our neighbor asked if we were safe. He said it was the Day of Judgement, when the Quran says the sun will rise from the west and the seas will flood, when all the dead will rise and Allah's angels will weigh our sins and virtue, expediting the good to Paradise and the bad to Hell. Though it was barely twilight, the muezzin suddenly called for prayer--not one mosque calling carefully after another, as they usually did, but all the mosques clamoring all at once, all over the city. There was shouting across the neighborhood. When I looked outside I saw people praying in the street.”
Source: Infidel (2007), Ch. 3
Help us to complete the source, original and additional information
Ayaan Hirsi Ali 56
Dutch feminist, author 1969Related quotes
                                        
                                        p, 125 
On the Sizes and Distances of the Sun and the Moon (c. 250 BC)
                                    
Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter II, Sec. 5
                                        
                                        p, 125 
On the Sizes and Distances of the Sun and the Moon (c. 250 BC)
                                    
                                        
                                        Fiction, The Other Gods (1921) 
Context: The moon is dark, and the gods dance in the night; there is terror in the sky, for upon the moon hath sunk an eclipse foretold in no books of men or of earth's gods...' There is unknown magic on Hatheg-Kla, for the screams of the frightened gods have turned to laughter, and the slopes of ice shoot up endlessly into the black heavens whither I am plunging... Hei! Hei! At last! In the dim light I behold the gods of earth!