Instagram have left open the option that in the future the curated timeline may also adjust the content of your feed so even if you could fix the ordering at a temporal level, there would still be omissions.
> As we begin, we’re focusing on optimizing the order — all the posts will still be there, just in a different order.[0]
Also the "promoted post" feature which they have in their new business tools[1] looks like down the track it will incorporate a feature where businesses can pay for their regular Instagram photos to appear in more feeds. Which means even more that the `/posts` endpoint which you hit as a user is controlled by Instagram
> As we begin, we’re focusing on optimizing the order — all the posts will still be there, just in a different order.[0]
Also the "promoted post" feature which they have in their new business tools[1] looks like down the track it will incorporate a feature where businesses can pay for their regular Instagram photos to appear in more feeds. Which means even more that the `/posts` endpoint which you hit as a user is controlled by Instagram
[0]: http://blog.instagram.com/post/141107034797/160315-news [1]: http://blog.business.instagram.com/post/145212269021/new-bus...