Shading is displaying degrees of lights and darks in a picture by coloring.

i this is the answer i looked it up on google so in 2020 new year's occurs on january 1st, 2020 and christmas on december 25th, 2020. these dates are 51 weeks and 2 days apart, not one week apart (during the year new year's occurs before christmas).

answer/// priests singing psalms and the congregation singing responses;