Distance to equator = Radius of Earth * cos (latitude)
where:
Radius of Earth = 6378.1 km
Latitude = 28.6 degrees north
Distance to equator = 6378.1 km * cos (28.6 degrees)
= 6378.1 km * 0.8829
= 5642 km
Therefore, the distance to the equator from New Delhi is approximately 5642 km.