Unlucky 13

During calendar year 2009, there is Friday on Feb 13, Mar 13, and Nov 13. This happens only once in 11 years. It is believed that 13 is unlucky and Friday on 13th of any month is most unlucky.

Reasons for the above belief:

• There was a ship "Friday 13" with British Navy. This ship started journey on Friday on 13th and didn't returned.
• On Apr 11, 1970, Project Apollo of Nasa, "Apollo 13" was launched at 13:13 (01:13 PM) was set on fire after 2 days, but all the astronauts were saved. The date was 11-04-70 (i.e. 1+1+4+7 = 13)
  
• Many hospitals skip bed or room number 13, toll buildings skip floor number 13 and many airline terminals skip gate number 13.
• President Roosevelt never traveled on 13th of any month and never hosted 13 guests at a meal.
  
• According to a numerologists 13 is suffered at its position which is after 12. As twelve is a complete number - 12 months in a year. Zodiac, 12 gods of Olympus, 12 labours of Hercules, 12 tribes of Israel, 12 apostles of Jesus, 12 days of Christmas and 12 eggs in a dozen.