= 2157.75 seconds = 35 minutes 57.75 seconds to get a time of 20:49:02.4 UTC for the center of the shadow. Putting in the longitude/latitude/altitude coordinate values -124,14,0 into JPL Horizons gives an expected time of 20:49 for the transit, which is in good agreement once again. On 1 September 1999 the distance between the Earth and Mars was 9.9 light-minutes. Other observations Transits of Phobos in 2019 were detected as a transient drop in the solar array current data of the InSight lander. At the time the data were only acquired at 30s intervals, and so the events were only recorded as single-sample dips of a few to a few tens of per cent. During the transits of spring 2020, all instruments onboard InSight recorded with full sampling rate and a slight tilt of the ultra-sensitive seismometer was observed, as well as a drop in solar irradiation and a 2 K drop in surface temperature. The tilt of the seismometer was caused from contraction of the ground due to the temperature drop; everywhere but in the shadow the thermal shielding around the seismometer. See also Astronomy on Mars List of missions to the Moons of Mars Solar eclipses on Mars Transit of Deimos from Mars Transit of Earth from Mars Transit of Mercury from Mars References Further reading J. Bell, M. Lemmon, M. Wolff, Transits of Mars I and II, IAU Circ., 8298, 2 (2004). (TeX DVI file is at ). External links JPL Horizons (must use telnet interface for non-Earth observation points) Opportunity image gallery: Sol 42 (small images of the 7 March 2004 grazing transit are near the top of the page). Opportunity image gallery: Sol 45 (small images of the 10 March 2004 transit are near the middle of the page). Opportunity image gallery: Sol 47 (small images of the 12 March 2004 transit are near the bottom of the page). Animation of 10 March 2004 transit Astronomical transits Phobos (moon) Articles containing video clips