Annual results for the flow ecliptic longitude derived from the 0° latitude lines of sight. The horizontal full line represents the average value of the results in the ecliptic. Four previous determinations of the flow ecliptic longitude derived with different methods are also marked: the Quémerais et al. (1999) Lyman-α line profile reconstruction and projected velocity map based on 1996–1997 SWAN hydrogen-cell data (asterisk), the Lallement et al. (2005, 2010) zero-Doppler-shift method from the same data in 1996 and 2001, respectively (squares), and the Quémerais et al. (2014) triangulation method from SWAN and MESSENGER coupled observations in 2010 (circle). All previous determinations lie within the standard deviation range (dotted lines) determined in our analysis.