1. Varahamihira was a renowned scholar from the Gupta era in India who made significant contributions to diverse fields including astronomy, mathematics, architecture, and water exploration. 
2. The document discusses Varahamihira's theories on cloud formation and long-term rain prediction based on observations of planetary positions and animal behavior. It also describes ancient Indian methods for groundwater exploration using indicator plants and techniques that aligned with modern hydrological principles.
3. Key contributions of Varahamihira mentioned include treatises on astronomy and a text on groundwater exploration techniques using indicator trees and their morphological features to locate subsurface water sources.