1° = 60′ 1′ = 60″ 1° = 3600″
Example: A₁ = 45°34′56″ , A₂ = 25°45′39″
Sum: 45°34′56″ + 25°45′39″ = 70°79′95″ → 70° + (1°19′) + (1′35″) = 71°20′35″ Difference (A₁−A₂): convert to seconds: 164096″ – 92739″ = 71357″ → 19°49′17″