Give reasons:
1.
A long spanner is used to undo a tight bolt.​

Because the longer the spanner is, the more is the perpendicular distance between the axis of the spanner through which it rotates and the distance of your hand. And when the perpendicular distance is more, less force is required. Try using the spanner by holding it with ur hand kept near the nut.

To determine in which constellation the Sun is found at any time of the year.

Explanation:

Have located the stars in the various constellation. The Sun is found at any time in the year. Based on this the birth dates are determined for its meaning. But any year or every year the sun is found in the same place and same time. The various constellation connected to sun and earth are Sagittarius, Capricorn, Taurus, Gemini, Cancer, Aquarius, Pisces, Virgo, Libra and Scorpio, Aries. The constellation and date numbers are defined with appropriate meaning. For example, the Sun is found to be in Virgo from September 16 to October 31.