advertised Intake Closing timing (Angle) in degrees ABDC

what is it and how do you figure it out use this as an example I see two intake angles which do i want it for calculating DCR

Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 36.0 BTDC 70.0 ABDC 286.0 °
Exhaust 80.0 BBDC 34.0 ATDC 294.0 °

Spring Requirements: Triple Dual Outer Inner
Part Number 99838
Loads Closed 112 LBS @ 1.650 or 1 21/32
Open 300 LBS @ 1.180
Recommended RPM range with matching components
Minimum RPM 3000
Maximum RPM 6800
Valve Float 7200

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 13.0 BTDC 43.0 ABDC 105 236.0 °
Exhaust 57.0 BBDC 7.0 ATDC 115 244.0 °