Abstract
Among high-velocity clouds of neutral hydrogen (HVCs) a so-called Outer Arm Cloud, often interpreted as a part of the general warp of the Milky Way disc, can be distinguished, which is located at 49° ≤ l ≤ 161° and 4° ≤ b ≤ 31° and has quite smooth velocity variation along its length. Closer inspection of the arm shows that its velocity field can be explained in two ways: (i) gas is moving in a circular orbit around the Galactic Centre, but the Sun has a galactocentric radial velocity component with respect to the Local Standard of Rest (LSR) of 28.5 km/s rather than -9.2 km/s as usually accepted; (ii) gas is moving in an elliptic orbit around the Glactic Centre
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