You can see a hazy dark area

Barely

As it's at the limit of goodneyes

So u can see it with the naked eye ?

yes

Why can’t one see black holes

U can barely see it with the naked eye ?

ya

guess it depends on what you mean by 'see'

Lol

can see a blotch there but won't be able to make out detail

you can 'see' letters at the doctors office but can't read them

But u know their is a letter there like u know tycho is there

yep

till we had telescopes we couldn't tell it was a crater

just a different shade

try it tonight, it's a mostly full moon

Do you have good eyes?

Yeah

So we all agree we can see tycho with the naked eye

Give it a try

yep

Ok

at 248000 miles that must be some sized crater for an eye to make it out

yep

it's pretty big

It’s 86 km

It’s 86 km

the biggest one on there apparently

We can see something 86 km from 248 thousand miles away ?

hmmm lets see if that makes sense

calculate the angular size

Visually does it make sense

i hate to make the heliocentric model take perspective into account but i think this is necessary

first start with angular size calculation

Do you know how to do that

**Question of the Day #217**

Can you make a spherical shadow with a straight object?

Please react in <#547645432604393482> and/or make your comments in the <#484514023698726912> 😃

https://media.discordapp.net/attachments/547645432604393482/633654857559179294/LJnPsLW.mp4

no i dont know how to do that

@jeremy it's easy

it's size/distance