What is the approximate fractional difference in time measured between a quartz watch crystal resonating either normally or parallelly to Earth's surface gravitation?
A watch with a crystal normal to g means that the crystal is perpendicular to the direction of gravity, while a watch with a crystal parallel to g means that the crystal is parallel to the direction of gravity.
The orientation of a watch's crystal does not affect the time elapsed. The time will continue to pass at the same rate regardless of the crystal's orientation.
Yes, the position of a watch's crystal can affect its accuracy. If the crystal is parallel to g, it can cause a slight variation in the timekeeping due to the effects of gravity on the internal workings of the watch.
There are some advantages to having a watch with a crystal parallel to g. This orientation can reduce the effects of shock and impact on the watch, making it more durable. It can also make the watch more accurate in certain positions, such as when lying flat on a surface.
It ultimately depends on personal preference and the intended use of the watch. For everyday wear, a watch with a crystal normal to g may be more practical and accurate. However, for activities that involve a lot of movement and potential impact, a watch with a crystal parallel to g may be more suitable.