  The effect of "dark energy" (i.e. the Lambda-term in Einstein equations) is
sought for at the interplanetary scales by comparing the rates of secular
increase in the lunar orbit obtained by two different ways: (1) measured
immediately by the laser ranging and (2) estimated independently from the
deceleration of the Earth's proper rotation. The first quantity involves both
the well-known effect of geophysical tides and the Kottler effect of
Lambda-term (i.e. a kind of the "local" Hubble expansion), while the second
quantity is associated only with the tidal influence. The difference between
them, 2.2 +/- 0.3 cm/yr, can be attributed just to the local Hubble expansion
with rate H_0^(loc) = 56 +/- 8 km/s/Mpc. Assuming that Hubble expansion is
formed locally only by the uniformly distributed dark energy (Lambda-term),
while globally also by a clumped substance (for the most part, the cold dark
matter), the total (large-scale) Hubble constant should be H_0 = 65 +/- 9
km/s/Mpc. This is in reasonable agreement both with the commonly-accepted WMAP
result, H_0 = 71 +/- 3.5 km/s/Mpc, and with the data on supernovae Ia
distribution. The above coincidence can serve as one more argument in favor of
the dark energy.
