Are cell mutations always bad? A mutation is a change in the genetic material of an organism. We are made from trillions of cells, each with a nucleus composed of DNA â a set of instructions that tells the cell what to do. Cells copy themselves with astonishing accuracy, but every now and then a piece of code is copied incorrectly.
Seven eclipses occur in a minimum of 12 lunar months (about 354.37 days). Given that the calendar year is only about eleven days longer than 12 lunar months, the first of the seven eclipses has to come in early January for the seventh eclipse to occur before the end of the year.
A lunar eclipse occurs during a Full Moon when the Earth is between the Sun and the Moon and when the Moon passes through some of the Earth's shadow.. 1  Date. Type. 2  25 April 2013. Partial Eclipse. 3  15 April 2017. Total Eclipse.  8 October 2017. Total 1  Eclipse. 4 April 2017. Total Eclipse.  28 September 2017. Total Eclipse.