In large scale surveys of the Universe there are found to be huge megawalls of galaxies. A 128 Mpc/h periodicity in galaxy redshifts is observed by Tom Broadhurst, Richard Ellis, David Koo and Alex Szalay, in Nature vol 343 p726. Some cosmologists have suggested that this might be some sort of wave structure. Now that the Hubble constant has been determined to be about 71 km/s/Mpc we can say that this wave is around 588 million light years in length. It is clear from the data that there are also several shorter waves that appear to be half and quarter of that wavelength. In geology, a series of long cycles have long been known and are estimated as 600, 300, 150, 74 and 37 million years in period. More recently, Moscow University Geology Prof S Afanasiev has (through his "Nanocycles Method") been able to accurately determine the period of the longest of these cycles to be 586.24 million years. There are many instances of other geology and climate related studies and cosmic ray fluctuations (which are suspected as a cause) finding periods near to 586, 293, 146, 73 and 36.5 million years. We need to understand that a wave with wavelength 586 million light years will oscillate in a period of 586 million years if it has velocity c, which applies to electromagnetic and gravitational waves. Therefore it seems very likely that these two phenomena are in fact one. There are huge standing waves in space that lead to the formation of galactic superclusters and which also cause repeated fluctuations in cosmic rays, temperature and climate generally on Earth. Furthermore, the fact that Prof Afanasiev has very accurately determined the cycle period allows us to use the 128 MPc/h redshift periodicity to determine the Hubble constant with great accuracy. Based on published data this gives H = 71.2 +/- 0.3 km/s/MPc, but a better analysis of the data using the obviously present harmonics also would allow improved accuracy with 0.1 or even 0.01 km/s/MPc being achievable. This method bypasses the entire stepladder of distances in cosmology with all its various problems.