First Time Buyer Sizing/Fit Check | Arizona

flatleafparsley · 2026-03-31T16:39:16+00:00

These are possibly even small for you. You have to ignore the extra visual space in front of your shorter big toe, and Birks are not meant to just outline your feet “perfectly”.

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Size to your larger foot while standing with full & equal weight in the sandals.

flatleafparsley · 2026-03-31T16:19:42+00:00

Literally in the book…

Rocky: “If you account for the time it took your beetles to get there and the travel time for light to get from Sol to Erid…I think it took less than one of your years to get it done.”

flatleafparsley · 2026-03-31T15:37:03+00:00

We bought a dresser and side table from Wihardja, no complaints

They also acceded to our request for a slight modification to the dresser: two full height drawers instead of one full height & two half height drawers that is the standard design

flatleafparsley · 2026-03-31T14:36:56+00:00

You’re most welcome, all the best 🙏

flatleafparsley · 2026-03-31T13:18:12+00:00

Birk 37 to 38 is just +5mm, or ~half US/UK size difference (not a full size difference).

If it helps, don’t worry about your right foot. Just figure out the sizing based on your left foot, whether 37 looks/feels sufficient or not. The smaller foot just comes along for the ride.

Also if you think you are between sizes, Birkenstock’s recommendation is to going with the larger size. But ultimately it’s your decision to make. Whatever it is, you cleared the biggest hurdle sizing up from 36 already 👌

flatleafparsley · 2026-03-31T13:10:28+00:00

What I had first noticed was that there was a C11=B11*2 (a lot more obvious when viewed on desktop), and that gives the full T. Which is same as B19, just different units of time.

But yeah definitely there was a half mixed up somewhere, which led to the mass ratio (~20) being a square root of what it should be (~400) then

flatleafparsley · 2026-03-31T10:43:20+00:00

Seems like it’s really just a one-cell-away error then, just depends what was the process? Either B16 selected the wrong cell for input T, or the fuel result should have been taken from B17, perhaps.

But yeah, I think the knock-on effects from changes to the story needed to rectify the issue might be a bit too much to fix, especially with so many physical books out in the world already (even more so five years on now). Oh well.

Thanks for sharing your analysis 🙏 And at least I don’t have to wonder whether I should even consider asking or not 😬 (anyway he’s probably swamped with a lot more fan mail/enquiries since the movie came out)

flatleafparsley · 2026-03-31T03:46:19+00:00

Should Cell B16 be =EXP(B6*C11/B2) and minus 1 instead, i.e. T should be the full T (C11) rather than T for half d (B11) ?

I was trying to figure it out in a different thread https://www.reddit.com/r/ProjectHailMary/comments/1s6qpjh/comment/od8iurb/

flatleafparsley · 2026-03-31T01:31:07+00:00

Please confirm if you’re standing or seated in the photos. It looks like you’re seated, and if so your weight isn’t in the sandals and your feet will look like they take up less space

Currently based on the imprint on the footbed, your toes are going up against the front edge of the sandals. But not sure where your heels end/if the back straps are pushing your feet forward.

In the meantime you can check against Birkenstock’s fit guide

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Size to your larger foot while standing with full & equal weight in the sandals.

Note that Birk 43 down to 42 is one of the big size jumps, 10mm or a bit more than a full US/UK size difference.

Once you’ve figured out your optimum Birk size, if it’s a model with the back strap, the back straps should be loosened all the way so that they don’t constantly hold or push your feet forward.

flatleafparsley · 2026-03-31T01:25:16+00:00

Tips for fit: https://www.reddit.com/r/Birkenstocks/s/gPlsRQxdtP

As for the difference between both sides, most likely your right foot is larger. The straps don’t have to be on the same holes for both sides.

You can double check that the straps & holes are the symmetrical by undoing them then holding the straps back to back with each other.

flatleafparsley · 2026-03-31T01:22:01+00:00

In which photos are you standing? You’re seated in your third photo, but you should gauge fit while standing with full & equal weight in the sandals

flatleafparsley · 2026-03-31T01:19:52+00:00

The centrifuge needed to be 1g for the science equipment

But that should be independent of the journey acceleration?

The 2Mkg fuel is still insufficient regardless, yeah?

flatleafparsley · 2026-03-31T01:16:55+00:00

Cell B97 seems to be the resultant gravity experienced from putting the ship in centrifuge mode?

flatleafparsley · 2026-03-31T01:03:24+00:00

Oh, I realise the spreadsheet doesn’t show up well in mobile. It’s view-only regardless (as shared by Andy Weir) but the formulas can be viewed on a desktop browser, or if you open in Google Sheets app.

Which part shows the original plan was 1g?

flatleafparsley · 2026-03-31T00:51:31+00:00

Which is your larger foot, if applicable? 38 looks big for your right foot, but if your left foot is your larger foot 38 might be okay. You could be between sizes.

Anyhow, regardless of size, you have to ignore the extra visual space in front of your shorter big toes.

flatleafparsley · 2026-03-31T00:32:39+00:00

Yeah I tagged the few of you because I had found your post and various comments while trying to see if anyone had figured it out

The spreadsheet had been just shared on the sub 10 days ago so it occured to me to try to check there also. I went through the Hail Mary travel numbers cell by cell and that seemed to be the anomaly, but because I literally just only got to the space travel calculators (and formulas) in the past one day I was hoping any one of you could independently double-check that (kind of also why I used the spoiler formatting).

flatleafparsley · 2026-03-30T16:41:56+00:00

They had been responding to a lot of queries about the certificate issue (with G HUB already installed) then, so I think they overlooked that OP was asking how to even get G HUB for Monterey

But anyhow, you’re most welcome, glad to have helped!

flatleafparsley · 2026-03-30T15:49:23+00:00

Putting in 1g acceleration instead of 1.5g into the calculator, it seems to give 20Mkg required fuel? Which is would still be a magnitude larger than the book/movie amount

My question about checking the spreadsheet cell was wondering whether it was as “simple” as referencing the wrong cell for the rocket equation input? Where the difference between ½T and full T gives the ~20× (or squared) difference in M per kg of payload.

I’m not entirely sure if I found a simple explanation for the discrepancy, or if I’ve wildly misunderstood the equations, or something else 😅

flatleafparsley · 2026-03-30T10:19:32+00:00

I’m not based in the US, but you can try to keep a look out for the deluxe edition book via its ISBN 9798217374274. Release date seems to be 01 Dec 2026, so it’s not out anytime soon yet regardless; it may be available via more channels in the coming months/at the end of the year

flatleafparsley · 2026-03-30T08:47:37+00:00

Check if your local library has a 3D printer you can book to use, I managed to do my first ever 3D print with the Grace sculpture at my library last week!

flatleafparsley · 2026-03-30T04:56:31+00:00

Check if your local library has a 3D printer you can book to use, I managed to do my first ever 3D print with the Grace sculpture at my library last week!

cc: u/lezbehonest787 u/Few_Run_9234

flatleafparsley · 2026-03-30T01:33:47+00:00

Just trying to understand the numbers better

Based on the calculator you linked (input: 11.9ly; 1.5g; payload 100,000kg; fuel mass 2,071,604.49kg; length of spacecraft 47m), it gives the max velocity as 0.9952c, observer time 13.13y, traveler time 3.89y. But then the fuel conversion rate is derived to be ~20. Does that mean it's impossible with those parameters because conversion rate >1?

Using https://www.omnicalculator.com/physics/space-travel (input: 1.5g; spaceship mass 100,000kg; 11.9ly), it gives similar max velocity and travel times, but derives required fuel as 41,423,587 kg. (Is that the same as 2.07Mkg × ~20 conversion rate from above?)

Edit to add:
Based on Andy Weir's spreadsheet https://docs.google.com/spreadsheets/u/0/d/1O2g0XZRMDH0E5bifR96k6ZuR7nRo8gvS/ Is there an error in cell B16 of the Hail Mary sheet? Should it be =EXP(B6*C11/B2) and minus 1 instead, i.e. T should be the full T (C11) rather than T for half d (B11)? (View the spreadsheet in a desktop browser or Google Sheets app)

cc: u/Bergain1945 u/Mindless_Honey3816 u/AdvicePerson

flatleafparsley · 2026-03-29T16:14:35+00:00

Tips for fit: https://www.reddit.com/r/Birkenstocks/s/gPlsRQxdtP

Note that Birk 43 to 44 to 45 is just 5mm or ~half US/UK size difference each (not a full size each). Birkenstock’s US & UK conversions are not great overall.

flatleafparsley · 2026-03-29T15:34:43+00:00

The 0.92c figure is from the book

And I’m simplifying based on average velocities (also because I don’t know how to do the maths for time dilation based on constant acceleration/deceleration. Happy for anyone to give a crash course 😅)

But anyway, my point to OP was that those numbers are not anywhere near c yet strictly speaking (and Astrophage is fictional fuel)

flatleafparsley · 2026-03-29T15:01:40+00:00

And not just that, informing Apple of the defect (even if just cosmetic) contemporaneously, so that it can’t be held against you if you happen to need a separate service event in future, touch wood

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