Where is the sensor that turns the headlights on and also the sensor that turns the sat nav into night mode thank you

Ive had my freelander 1 04 hse td4 for three years now and its looked after by a land rover mechanic its wants for nothing all that could go wrong has been sorted before it does so im a happy chappie and getting just short of 40 mpg the previous owner was a farmers wife who had the car looked...