It’s Friday now.  It will in fact be Friday now until midnight tonight, local time.  Indeed, one could argue it will be Friday now until finally midnight strikes at the international date line, when this Friday will finally be gone from the entire Earth, forever.  So, though as a matter of physics there is no universal “now”, and even for individuals, the “now” is an evanescent thing, a constantly moving and infinitesimal single frame of the movie of one’s existence, nevertheless that “now”, for me and for most others on Earth, will still be Friday for some time.

How many such “nows” are there, even for one individual?  Well, that depends a bit.  If the Planck time (5.39 x 10^-44) is just an artifact of our lack of complete knowledge or ability to calculate, and time is truly continuous, then there is an uncountable infinity of such “nows” in any given day, or indeed in any given hour, or in any given second, or in any given picosecond, or indeed, in any given Planck time*.

Such is the nature of the uncountable infinity, as in the case of the real numbers:  between any two numbers, no matter how arbitrarily close you want to make them (as long as they are not identical) there is an uncountable infinity of numbers, larger than the number of possible quantum states in the visible universe, larger than the “countably” infinite number of integers.  In fact, that uncountable infinity between any two such real numbers is as large as the uncountable infinity of the set of real numbers itself, of which it is a subset.

Infinities are weird.  You need to be careful with them.  I doubt that contemplating them has actually driven anyone to madness‒though it’s easy enough to imagine that it might exacerbate depression‒but maybe minds somewhat prone to madness are more likely than others to contemplate infinities in the first place.  In any case, contemplating them can put other things into perspective.  For instance, no matter how arbitrarily large a number you might pick, it is just as far from infinity‒even the boring old “aleph nought” infinity‒as is the number one.

An interesting thing to contemplate is that, if you could pick a truly random number from, say, all positive integers, you would almost certainly get some number far huger than any number ever named or contemplated by humans, larger than a googolplex, larger than Graham’s number, larger than TREE(3), larger than the time required for a Poincare recurrence of the cosmos.  Graham’s number (for example) is big; the information required to state it precisely, if contained within the space equivalent to a human brain, would cause that space to collapse into a black hole!  But Graham’s number is nevertheless finite, and so there is a finite number of positive integers lower than Graham’s number but an infinite number of them larger than it.

It’s interesting to note the related fact that the chance of you randomly picking any particular integer is mathematically equivalent to zero‒so I’m told‒and yet you will pick some number.  Let that bake your noodle for a bit.

By the way, when I earlier compared the moments between two points in a continuous time stream to the number of possible quantum states in the visible universe, I was being a bit contradictory.  After all, our designation of the maximum number of possible states in a given enclosed region of spacetime‒which is “equivalent” to the number of square Planck lengths (each such square being 1.6 x 10^-35 meters, squared, or 2.6 x 10^-70 square meters) in the surface area of a sphere surrounding such a region**‒is based on quantum mechanics, and thus implicitly entails time being only sensibly divisible down to the scale of the Planck time.  So comparing that to a continuous time is comparing two fundamentally incompatible realities.

Oh, incidentally, I’m writing this post on my smartphone today.  I just didn’t feel up to bringing the lapcom with me yesterday, and I didn’t expect to write any on The Dark Fairy and the Desperado today.  I did, however, have a bit of a thought, as I’m prone to do when conscious, whether I want to do it or not.

That thought was that, perhaps, I can try to write my blog posts in the evenings‒on the way back from work, say‒but set them up still to be published the following morning and work on fiction in the morning.  Writing fiction seems to give me a boost, mental health-wise, when I do it in the morning.  It’s quite ego syntonic, as they say, or at least it seems to be.  But I don’t really want to stop writing this blog.  Then I’d just be floating in the void all alone, writing fiction that I like but that almost no one else will ever read.  That is a discouraging thought.

In any case, I don’t think I’ll be writing a post (for) tomorrow, since I don’t think I’m going to be working tomorrow.  If I am, and if I cannot get out of it, I guess I will write a post, and it will likely be a grumpy one if it happens.  But I may start next week writing the following day’s blog post on the evening before and doing fiction in the morning.  One good aspect to writing fiction in the morning is that the initial writing and the editing process are separate.  I don’t have to edit what I write each day on that day, which I have to do with this blog.

We shall see what happens.

In closing, I leave you with this juxtaposition of two notions:

*If time is not sensibly divisible even in principle below the Planck time, then the maximum number of “nows” in a given day is just 24 hours divided by the Planck time, or about 1.6 x 10⁴⁸ “nows”.

**See Bekenstein-Hawking black hole entropy calculations and the Holographic Principle.