INTRODUCTION TO AUTOCAD – PART 5 – EDITING OBJECTS

KEY CONCEPTS

• SELECTING OBJECTS
• EDITING WITH GRIPS
• EDITING LAYERS
• COPYING, MIRRIORING ETC.
• ARRAYING OBJECTS
• RESIZING OBJECTS

AIMS AND OBJECTIVES

• To gain an understanding of how to edit objects that have been drawn in AutoCAD.

Previous lessons:

Introduction to AutoCAD – Part 1
Introduction to AutoCAD – Part 2 – Organising your drawing setup
Introduction to AutoCAD – Part 3 – Using coordinate system
Introduction to AutoCAD – Part 4 – Creating objects

Next Lesson:

• Using object snap in AutoCAD

Palindrome numbers in the date

Well my uncle has pointed out the palindrome number of yesterday’s date, 01/02/2010 backwards is the same. It has been a discussion for two days now. My brother Quintin, and cousin Derron think I am bored out of my find. But have to agree with me friend Andrea it is a cool fact, esta bom! That’s it!

Well using the astronomical calendar, which by the way has a year zero; here are the results on the algorithms used:

In the millennium of the year 0000 (zero):
Occurrences: 36 times
Starting at the year zero it occurred for the first time on 01/10/0110.
Here is a definite pattern. It occurs for 4 years consecutively and then skipped 96 years.
Happened the last time for this area on 31/10/0113

In the millennium of the year 1000 :
Occurrences: 61 times
It skipped 87 years Happened for the first time in this time frame on 10-01-1001. This time only consecutively for 3 years.
Skipped 6 years, (01/01/1010) and for this time consecutively for 4 years.
Then it skipped 6 years and happened consecutively for 3 years.
Then it skipped 7 years (05/11/1150) and happened consecutively for 3 years afterwards, until 29/11/1192

In the millennium of the year 2000 :
Occurrences: 60 times
This is in my life time 🙂
Skipped 808 years. (10/02/2001) and for this time consecutively for 2 years only.
Then it skipped 7 years and happened yesterday (01/02/2010). This time it is going to occur 3 years consecutively.
Will skip 7 years and occur for 3 years consecutively until 10/21/2101. Here it will skip 8 years and occur for 3 years consecutively
Then it will skip 6 years and occur for 4 years consecutively.
Then it will skip years and occur for 3 years consecutively.
Then it is back at skipping 7 years and occurring for 4 years consecutively until 29/12/2192.

In the millennium of the year 3000 :
Occurrences: 31 times
Skipped 808 years (10/03/3001) and blah, blah, blah…

In the millennium of the year 4000 :
Occurrences: 31 times
Skipped 908 years (10/03/3001) and blah, blah, blah…

It keeps on skipping 908 years for every millennium until 29/09/9092 then we estimate that it will skip 1017 years and occur again on 01/10/10110.

Download the csv file here.

My conclusion:
This is just cool things. If you use another date format or calendar this is totally obsolete. Another point that has been discussed and we don’t have the answers is: If an eclipse ellipse has 360 degrees, the earth rotate around the sun in a form of an eclipse ellipse, why do we have 365 ¼ days per year?