Re: DT in BGT
0 radians generally points along the positive x axis, so I would expect 90dg to move along the y axis.
As for x, notice the number of 0s. This is the limitation of floating point arithmetic, aka rounding error. Pi/2 is an irrational number with infinitely many digits. You can't represent all of those in 64 bits. You can't represent all of those in 9000 bits, because 9000 is less than infinity. So you inevitably have some minor discrepencies due to rounding. As a general rule, physics in the real world struggles beyond the 8th decimal place, unless you're dealing with quantum mechanics, for which PCs are woefully inadequate. So, if the drift due to rounding errors is small enough that it wouldn't be measurable by a human in any cases that are going to show up, it's generally safe to treat 0.00000001 as 0.
I mean, you have 10 zeros after the decimal point. If you're measuring in meters, that is enough accuracy that you'd need som
e very expensive equipment to detect the difference. It's still bigger than atoms, but I'm not sure that a paramecium would notice.
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