62 



Lunar Eclipses. 



The Sun being a bright object and larger than the Earth will 

 form a conical shadow of the Earth, and if a line were drawn 

 joining the centres of the Sun, the Earth, and the point of the 

 shadow will always lie in the plane of the Ecliptic and the axis 

 of the Earth's conical shadow will intersect the ecliptic in a point 

 exactly opposite to the centre of the Sun, or 180° distant in longi- 

 tude from the Sun. If the Moon performed her revolution round 

 the earth in the plane of the ecliptic she would pass through the 

 earth's shadow once a month when in opposition, and be eclipsed, 

 but as her true orbit is inclined 5° 8' 48" to the echptic, it is 

 plain that she may lie above or below the ecliptic from 0° to 5° 

 8' 48" latitude at the time of opposition, and in fact she generally 

 passes the shadow of the earth when in opposition. In order to 

 undergo an eclipse she should pass through the shadow. There 

 can be no eclipse of the moon unless the distance of her centre 

 from the centre of the earth's shadow become less than the sum 

 of the semi-diameters of the moon and shadow. There cannot 

 be a total eclipse of the moon unless the distance of her centre 

 from the centre of the earth's shadow become less than the 

 difference of the semi-diameters of the moon and shadow. The 

 commencement and end of an eclipse will take place when the 

 distance of the moon's centre from the centre of the earth's 

 shadow is equal to the sum of the semi-diameters of the moon 

 and shadow. The commencement and end of the total part of 

 an eclipse will take place when the distance of the moon's centre 

 from the centre of the earth's shadow is equal to the difference 

 of the semi-diameters of the moon and shadow. 



LITERATURE AND MEN OF BUSINESS. 



By the President, F. J. GRANT, J.P. Opening Address. 

 September 25th, 1888. 



Many people are of opinion that " literature " and " business " 

 cannot exist together, that they are wide as the poles asunder. 

 It is the design of the address to show that a connection between 

 the two is possible, and moreover necessary for the proper dis- 

 charge of the manifold duties of life and for maintaining a due 

 sense of proportion in our several concerns. 



Literature enters into our ordinary life more largely than is 

 generally admitted. The gradations of a man's illness may often 



