Density Altitude w/a Ballistics Program

[bill123]

I have a Kestrel that I use to get my DA. I then put the DA into Ballistic AE which also asks me for the Temp or Mach.

Here's my question. DA is calculated as:
Pressure Altitude + [120 x (OAT - ISA Temp)]

OAT is local temperature from a thermometer.
ISA Temp is always 15 °C at sea level.

From that formula, it looks like DA includes temperature already. Why is Ballistic AE asking for Temp. again?

 

[bill123]

I have a Kestrel that I use to get my DA. I then put the DA into Ballistic AE which also asks me for the Temp or Mach.

Here's my question. DA is calculated as:
Pressure Altitude + [120 x (OAT - ISA Temp)]

OAT is local temperature from a thermometer.
ISA Temp is always 15 °C at sea level.

From that formula, it looks like DA includes temperature already. Why is Ballistic AE asking for Temp. again?

Got the answer myself. The Atmosphere pages ask for Temp to calculate Mach. DA already takes Temp. into account.

 

[MMERSS]

Additionally,

If your ballistics program is using temperature regression for correcting MV according to powder temperature you will need the temperature. Another consideration when using DA requiring a separate temperature input.

 

[bill123]

Additionally,

If your ballistics program is using temperature regression for correcting MV according to powder temperature you will need the temperature. Another consideration when using DA requiring a separate temperature input.

Thanks, I'll look into that as well.