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In these consumerism days, it is the day when we usually go back to the store to exchange Christmas gifts (especially clothing with wrong sizes) or to get bargains (our "black friday" equivalent) at the after Christmas sales specials.
Boxing Day originated in England hundreds of years ago. Wealthy people with servants would give them the day off on the 26th & would give them a Christmas "box" i.e. a sum of money. Another version has it that it refers to tradesmen or others who provide a service (e.g. garbage men) receiving a similar Christmas "box" or tip on the day after Christmas. One final version is that churches would collect money in an offering "box" for the poor in the period leading up to Christmas. They would distribute the alms collected in the box on the 26th in honour of St. Stephen, the first Christian martyr, whose feast day is the 26th.
Overall, a somewhat more honourable day than the current version where for some reason after spending 2+ months buying a bunch of useless stuff, people want to go out and spend a load more money on more stuff they really don't need but have to have because it's "cheap"!!!!
Read the Wiki article.
But, from a Canadian's perspective, it helps keep us grounded. We grew up sharing what we had with those around us all year, and did they to us... It helps to build community spirit and establish new friendships.
The doppler effect, applied to light, causes red/blue shift. Blue shift if the object is moving away from the observer, and vice versa. So to us the uiniverse looks blue because it is all expanding. Blueshift - Wikipedia[^] "Doppler blueshift is caused by movement of a source towards the observer.
Theory of relativity: Theory of relativity - Wikipedia[^] "The speed of light in a vacuum is the same for all observers, regardless of their relative motion or of the motion of the light source."