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  1.                                                                                 Comets:
  2.  
  3.  
  4. Predicted Perihelion Passages of Comets, 1992:
  5.  
  6.                                          Revolution    Perihelion
  7.                          Perihelion        period       distance
  8.    Periodic comet          date             years          au*
  9.  
  10. Giacobini-Zinner          Apr.  13           6.6          3.52
  11. Tsuchinshan 2             May   20           6.8          3.60
  12. Kowal 1                   June   1          15.1          6.10
  13. Grigg-Skjellerup          July  22           5.1          2.96
  14. Smirnova-Chernykh         Aug.   5           8.6          4.19
  15. Shoemaker 2               Aug.   8           7.9          3.96
  16. du Toit-Hartley           Aug.  28           5.2          3.01
  17. Wolf                      Aug.  28           8.3          4.08
  18. Daniel                    Sep.   1           7.1          3.68
  19. Schuster                  Sep.   6           7.3          3.75
  20. Giclas                    Sep.  13           7.0          3.64
  21.  
  22.  
  23.  
  24. * [1 au = approximately 93 million miles, or the distance between
  25.   the Earth and the sun.]
  26.  
  27. Source:The Nautical Almanac Office, U.S. Naval Observatory.
  28.  
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