FREE BOOKS

Author's List




PREV.   NEXT  
|<   131   132   133   134   135   136   137   138   139   140   141   142   143   144   145   146   147   148   149   150   151   152   153   154   155  
156   157   158   159   160   161   162   163   164   165   166   167   168   169   170   171   172   173   174   175   176   177   178   179   180   >>   >|  
The general aspect of the page is now somewhat crowded, yet, considering the quantity of figures on each page the arrangement is marvellously clear and legible. The Spanish "Almanaque Nautico" has been issued since the beginning of the century. Like its fellows it has been gradually enlarged and improved, in recent times, and is now of about the same number of pages with the British and American almanacs. As a rule there is less matter on a page, so that the data actually given are not so complete as in some other publications. In Germany two distinct publications of this class are issued, the one purely astronomical, the other purely nautical. The astronomical publication has been issued for more than a century under the title of "Berliner Astronomisches Jahrbuch." It is intended principally for the theoretical astronomer, and in respect to matter necessary to the determinations of positions on the earth it is rather meagre. It is issued by the Berlin Observatory, at the expense of the government. The companion of this work, intended for the use of the German marine, is the "Nautisches Jahrbuch," prepared and issued under the direction of the minister of commerce and public works. It is copied largely from the British Nautical Almanac, and in respect to arrangement and data is similar to our American Nautical Almanac, prepared for the use of navigators, giving, however, more matter, but in a less convenient form. The right ascension and declination of the moon are given for every three hours instead of for every hour; one page of each month is devoted to eclipses of Jupiter's satellites, phenomena which we never consider necessary in the nautical portion of our own almanac. At the end of the work the apparent positions of seventy or eighty of the brightest stars are given for every ten days, while it is considered that our own navigators will be satisfied with the mean places for the beginning of the year. At the end is a collection of tables which I doubt whether any other than a German navigator would ever use. Whether they use them or not I am not prepared to say. The preceding are the principal astronomical and nautical ephemerides of the world, but there are a number of minor publications, of the same class, of which I cannot pretend to give a complete list. Among them is the Portuguese Astronomical Ephemeris for the meridian of the University of Coimbra, prepared for Portuguese navigators. I do not kn
PREV.   NEXT  
|<   131   132   133   134   135   136   137   138   139   140   141   142   143   144   145   146   147   148   149   150   151   152   153   154   155  
156   157   158   159   160   161   162   163   164   165   166   167   168   169   170   171   172   173   174   175   176   177   178   179   180   >>   >|  



Top keywords:
issued
 

prepared

 

matter

 
astronomical
 

navigators

 

nautical

 

publications

 

Portuguese

 

Jahrbuch

 

purely


arrangement

 
complete
 

intended

 
Nautical
 
German
 

Almanac

 

positions

 

respect

 

number

 

British


American

 

century

 

beginning

 

University

 

almanac

 
preceding
 

Coimbra

 

meridian

 

portion

 

ephemerides


apparent

 

satellites

 
Jupiter
 

eclipses

 

principal

 

devoted

 

phenomena

 

places

 

satisfied

 

collection


pretend
 
declination
 

tables

 

navigator

 

Ephemeris

 
brightest
 

Whether

 
eighty
 
considered
 

Astronomical