Next: Pulsar timing Up: A Tutorial on Radio Previous: Millisecond pulsar Velocities . ... Why is it difficult to measure timing proper motions for pulsars whose ecliptic latitude is zero? At what 2 times of year would you make interferometric observations to measure the parallax of a radio source with RA = 00:00, DEC 00:00 . Calculate the transverse velocities for pulsars that have distances of 100, 500, 1000, 5000, 10000, 50000 parsecs, assuming a proper motion of 10 mas/yr. ...