I have no working intuition on this, so I asked the Army again. Makes several hours difference (this time of year) as you go north from Seattle, about an hour as you go south:
arctic (W 122, N 78): 2:22 p.m. (all times PDT) Seattle (W 122.4, N 47.6): 6:05 p.m. San Francisco (W 122.4, N 37.8 (3 degrees south of Pgh)): 6:21 p.m. equator (W 122, N 0): 6:56 p.m.
no subject
Date: 2002-10-24 12:12 pm (UTC)arctic (W 122, N 78): 2:22 p.m. (all times PDT)
Seattle (W 122.4, N 47.6): 6:05 p.m.
San Francisco (W 122.4, N 37.8 (3 degrees south of Pgh)): 6:21 p.m.
equator (W 122, N 0): 6:56 p.m.