Awk looping within condition - awk

Question

I need to create a condition which separates the data by decade. The first column is the year value (going back to year 0). How do I change the condition within the awk query?
0 Jan 10 2:04:40 Tot D
0 Jul 05 11:33:06 Tot A
3 May 04 22:22:05 Tot A
3 Oct 29 1:32:40 Tot D
7 Feb 20 23:03:27 Tot A
7 Aug 17 5:58:18 Tot D
10 Dec 10 6:28:52 Tot A
11 Jun 04 15:36:12 Tot D
14 Apr 04 4:41:23 Tot D
14 Sep 27 7:18:39 Tot A
18 Jan 20 10:38:27 Tot D
18 Jul 16 18:04:17 Tot A
21 May 15 5:47:44 Tot A
21 Nov 08 9:27:47 Tot D
22 May 04 23:00:32 Tot A
25 Mar 03 6:19:48 Tot A
25 Aug 27 13:47:51 Tot D
28 Dec 20 15:07:37 Tot A
29 Jun 14 22:37:10 Tot D
32 Apr 14 11:56:36 Tot D
32 Oct 07 15:38:15 Tot A
36 Jan 31 19:07:10 Tot D
36 Jul 27 0:39:47 Tot A
39 May 26 13:13:25 Tot A
39 Nov 19 17:26:37 Tot D
40 May 15 6:26:43 Tot A
I need to present the data as follows:
awk '{if ($1 >= 0 && $1 < 10) print }' All_Lunar_Eclipse.txt
0 Jan 10 2:04:40 Tot D
0 Jul 05 11:33:06 Tot A
3 May 04 22:22:05 Tot A
3 Oct 29 1:32:40 Tot D
7 Feb 20 23:03:27 Tot A
7 Aug 17 5:58:18 Tot D
But I would have to do it manually for every 10 years.
awk '{if ($1 >= 10 && $1 < 20) print }' All_Lunar_Eclipse.txt
10 Dec 10 6:28:52 Tot A
11 Jun 04 15:36:12 Tot D
14 Apr 04 4:41:23 Tot D
14 Sep 27 7:18:39 Tot A
18 Jan 20 10:38:27 Tot D
18 Jul 16 18:04:17 Tot A
I have tried something similar to the following with no joy.
awk 'BEGIN { for (i = 0; i <= 2019; +=10) print i }'

Answer 1

$ awk '
int(p/10)!=int($1/10) {
print "New decade begins:"
}
{ p=$1 }
1' file
0 Jan 10 2:04:40 Tot D
0 Jul 05 11:33:06 Tot A
3 May 04 22:22:05 Tot A
3 Oct 29 1:32:40 Tot D
7 Feb 20 23:03:27 Tot A
7 Aug 17 5:58:18 Tot D
New decade begins:
10 Dec 10 6:28:52 Tot A
11 Jun 04 15:36:12 Tot D
...
... on your definition of a decade (if ($1 >= 10 && $1 < 20)). I would've assumed that years 1-10 are the first decade 11-20 the second etc. Did not check, though. It would've made it one summation harder, too.

Answer 2

Depend on what your want but use the first line as info by dividing by 10 and catchin the integer value
awk '
# separator process
{ Decade = int( $1 / 10 ) }
# apply sample (unsorted and just stored by decade)
{ Data[ Decade] = Data[Decade] "\n" $0 }
END { for ( Dec in Data ) printf "--- Decade: %d ----\n%s\n", Dec, Data[ Dec] }
' YourFile