  For solar activity cycles 20 and 21 (1966-1985) the solar differential
rotation has been investigated using H{\alpha} filaments and relatively
small-scale long-lived magnetic features with negative and positive polarities.
We used annual averaged angular velocities of quiescent H{\alpha} filaments
from H{\alpha} photoheliograms of the Abastumani Astrophysical Observatory film
collection and selected long-lived magnetic features from the McIntosh atlas
(McIntosh, Willock, and Thompson, Atlas of Stackplots, NGDC, 1991). We have
determined coefficients of Faye's formulas for H{\alpha} filaments as well as
for long-lived magnetic features and have found that for solar cycles 20 and 21
the H{\alpha} filaments have lower rotation rates and rotated more
differentially than the long-lived magnetic features.
