457

The Math would add up(feddit.de)

posted
by
Avatar
einfach_orangensaft@feddit.de
in
Avatar
noncredibledefense@sh.itjust.works
162 comments
hidereport
Sort:
HotTopControversialNewOld
You are viewing a single thread.
View all comments View context
Avatar
mozz@mbin.grits.dev
7 points
*

You’re confused, sir. Light from the sun is collimated, yes, i.e. parallel rays. The correct equation if you’re going to apply the inverse square law is:

E = 850 watts / 149,597,971 km^2 * 149,597,871 km^2 = 849.998864 watts

Same reason a signal mirror can reflect a flash as bright as the sun even miles away off a surface a few inches square.

You can believe or not; I’ve explained it as clearly as I know how.

permalink
report
parent
reply
Avatar
TropicalDingdong@lemmy.world
-1 points
*

149,597,971

Where are you getting this number from? The number you need to be using is the distance from the earth to the ISS, 408,000 meters.

Second, your formulation of the inverse square law is incorrect, in that you are missing the 4pi component, but in the grand scheme of distances we’re looking at, its negligible. It also looks like you may have gotten the order of operations wrong.

Third

149,597,971 km^2 * 149,597,871 km^2

The hell even is it that you think you are representing by these numbers? What is it you think you are saying?

fourth

You can believe or not; I’ve explained it as clearly as I know how.

I can provide sources for all my claims, and I’m pretty sure I got all my math correct, within a ROM. I can’t say the same for your work.

permalink
report
parent
reply
Avatar
SchmidtGenetics@lemmy.world
4 points

The distance you need to account for is Sun to earth plus back to the satellite. Which I think is what they were using.

permalink
report
parent
reply
Avatar
TropicalDingdong@lemmy.world
-1 points

Yeah but what they are not accounting for is that the light actually has to come off the mirror. You can demonstrate this with a hand mirror that the illumination spot gets larger quickly at a distance. Take a mirror and find the sun. Send a reflection to the wall nearest you. Then send the reflection to a wall further away. The reflection on the wall further away is larger and therefore, the energy more spread out. The light coming off the mirror is not perfectly parallel as it had to pass through the atmosphere, then interact with the surface of the mirror. We do use mirrors for calibration in satellite remote sensing, but you will get far far far far more power arriving at something like the ISS coming from a much less powerful laser over such a distance. If we controlled by wattage, a laser will absolute crush a mirror in its ability to transmit energy over a distance.

permalink
report
parent
reply
Show more comments
Avatar
mozz@mbin.grits.dev
2 points

Where are you getting this number from?

I’m gonna leave the source of that and the other number and where the pi went as an exercise for the reader

permalink
report
parent
reply
Avatar
TropicalDingdong@lemmy.world
-1 points

So you are like, an actual idiot then. I guess I picked the right meme for you.

permalink
report
parent
reply
Show more comments

NonCredibleDefense

!noncredibledefense@sh.itjust.works

Create post

A community for your defence shitposting needs

Rules

1. Be nice

Do not make personal attacks against each other, call for violence against anyone, or intentionally antagonize people in the comment sections.

2. Explain incorrect defense articles and takes

If you want to post a non-credible take, it must be from a “credible” source (news article, politician, or military leader) and must have a comment laying out exactly why it’s non-credible. Low-hanging fruit such as random Twitter and YouTube comments belong in the Matrix chat.

3. Content must be relevant

Posts must be about military hardware or international security/defense. This is not the page to fawn over Youtube personalities, simp over political leaders, or discuss other areas of international policy.

4. No racism / hatespeech

No slurs. No advocating for the killing of people or insulting them based on physical, religious, or ideological traits.

5. No politics

We don’t care if you’re Republican, Democrat, Socialist, Stalinist, Baathist, or some other hot mess. Leave it at the door. This applies to comments as well.

6. No seriousposting

We don’t want your uncut war footage, fundraisers, credible news articles, or other such things. The world is already serious enough as it is.

7. No classified material

Classified ‘western’ information is off limits regardless of how “open source” and “easy to find” it is.

8. Source artwork

If you use somebody’s art in your post or as your post, the OP must provide a direct link to the art’s source in the comment section, or a good reason why this was not possible (such as the artist deleting their account). The source should be a place that the artist themselves uploaded the art. A booru is not a source. A watermark is not a source.

9. No low-effort posts

No egregiously low effort posts. E.g. screenshots, recent reposts, simple reaction & template memes, and images with the punchline in the title. Put these in weekly Matrix chat instead.

10. Don't get us banned

No brigading or harassing other communities. Do not post memes with a “haha people that I hate died… haha” punchline or violating the sh.itjust.works rules (below). This includes content illegal in Canada.

11. No misinformation

NCD exists to make fun of misinformation, not to spread it. Make outlandish claims, but if your take doesn’t show signs of satire or exaggeration it will be removed. Misleading content may result in a ban. Regardless of source, don’t post obvious propaganda or fake news. Double-check facts and don’t be an idiot.

Join our Matrix chatroom

Other communities you may be interested in

Banner made by u/Fertility18

Community stats

  • 4.5K

    Monthly active users

  • 1.8K

    Posts

  • 24K

    Comments

Community moderators