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High Energy Neutrino Astronomy energy windows may be ruled by a new Upward and Horizontal Tau Air-Showers (UpTaus, HorTaus) detectors (scintillators and optical arrays) located a few kilometers beyond facing High Mountains Chains, or located above their top or flying on Planes, on Balloons and on Satellites facing downward to the Earth Crust Horizon. While looking downward to the Earth seeking for Upward and Horizontal Tau Air-Showers the same optical detectors may often capture cosmic rays Cherenkov lights reflected or diffused by downward Shower cosmic rays hitting the Earth soil (a sea, a lake, ice lands, desert or ground). These new detectors may be built up as a circular hybrid crown array at high quota facing to horizon in correlation with present largest telescopes, like Magic or Shalon or ASHRA ones, if able to look below the Earth edge. The UpTaus and HorTau Astronomy at 1015 up to 1019 eV energy windows may test the largest primary neutrino fluxes in Z-Burst neutrino model needed to solve the GZK puzzle or even the smaller but inevitable GZK neutrino flux secondary of the same GZK cut-off. These HorTus signals might well be observed in future EUSO experiment

The Rise of High Energy Neutrino Astronomy at Horizon