impulse=f*delta T

here f= delta P(momentum)\delta T * delta T

delta T cancel with delta T

so, impulse will have same dimension as momentum

i.e. ML/t

Delta is a symbol meaning "change". Delta T means (T2-T1)

delta t is change in temperature

Depends on the temperature change. Delta means the change in. Delta t is the change in temperature (usually in kelvin or Celsius) so if the heat increased 50 C than delta t = 50. Delta t = Final T - Intial T

To calculate Delta t, you would subtract Universal Time or UT from Terrestrial Time or TT. Delta t would be the difference.