LST (Local Standard Time) follows your regional clock. LMT (Local Mean Time) adjusts explicitly for your precise geographic longitude offset from the timezone meridian, which alters boundary timings.
How does Vedic Planner data differ from data on other softwares?
Vedic Planner is a free to use tool and is being designed to remain free forever. Paid softwares use Swiss Ephemeris which requires licensing fees but Vedic Planner uses open source astronomical libraries for our calculations which is accurate within sub-arcminute of Swiss Ephemeris for 100 year span.
What is the definition of sunrise and sunset used in Vedic Planner?
For calculation purposes, sunrise and sunset tracks the moment the upper rim of the sun is tangent to an unobstructed horizon at sea level.