Update pvlib/irradiance.py

Co-authored-by: Cliff Hansen <cwhanse@sandia.gov>

Author: Omesh37

pvlib/irradiance.py

@@ -1984,8 +1984,6 @@ def dirint(ghi, solar_zenith, times, pressure=101325., use_delta_kt_prime=True,
        SERI/TR-215-3087, Golden, CO: Solar Energy Research Institute, 1987.
     """
 
-    if use_delta_kt_prime and len(times) < 2:
-        raise ValueError('The DIRINT model requires at least two times')
 
     disc_out = disc(ghi, solar_zenith, times, pressure=pressure,
                     min_cos_zenith=min_cos_zenith, max_zenith=max_zenith)