Title: 2008 Sichuan earthquake.
Question: Where was the worst of the quake lakes located?

Title: Greece.
Question: When was Constantinople taken over by the Ottoman?

Title: Sanskrit.
Question: What form of speech shows that Sanskrit and Prakrits existed together?

Title: Gregorian calendar.
Question:
In order to account for the full moon coming after the equinox, when was the equinox set?