COSine 2020 On-line program book

This year, thanks to Danyda Feldman’s1 diligent efforts2, we have an electronic version of the program book! You can download the app for your appropriate electronic buddy from EventsXD, or just search for EventsXD in your app store. Once you’ve downloaded it, you will need to create an account, then just search for COSine. The … Read more

Charity Raffle

Some of you may recall an earlier blog post where I said that the raffle for 2020 would be the Pikes Peak Observatory. Well, PPO is a project of NSSTI, and they told us that they are currently waiting on various approvals before moving forward, but their other related project, MESO—The Mobile Earth + Space … Read more

2020 Schedule

The COSine 2020 schedule is now available! This gives you more than a week to memorize it for the entrance quiz (don’t worry – you can still get in if you score at least 93%). Actually, there might be minor tweaks between now and the con, but we think it is basically correct! There will … Read more


We’ve had a few people contact us looking for roommates for the con, so we’ve set up an e-mail address: If you are are looking for a roomie, just send an e-mail to that address with some basic info: Days you will be staying Gender Contact info Anything else a potential roomie should know … Read more

COSine 2020 Program/Badge Artwork

Wow – Peri (our Artist Guest of Honor) just delivered the first version of the artwork for the program book, and it is awesome! The image is done in the style of a 14-15th century oil painting, and shows the COSine rocket landing next to a castle. I could easily see this as the cover … Read more

MileHiCon 2019

MileHiCon was this weekend up in Denver, and COSine had a table (currently manned by Ted in the picture–note the Tie Fighter bowtie). We had a lot of fun, talked to a lot of people, and signed up a bunch of people for COSine 2020! The picnic basket on the left was serving duty as … Read more

Participants page is up!

It’s taken a while, but the Participants page is now up! Part of the delay was that we just have so many great participants signed up for COSine 2020! (And, of course, was in no way related to yours truly getting distracted by other shiny things). This list is also not final – we are … Read more

Pikes Peak Observatory

Every year at COSine we hold a charity raffle, and for 2020 the charity we will be supporting is the Pikes Peak Observatory. The goal of the Pikes Peak Observatory initiative is to build a 1-meter research-quality observatory telescope on the summit of Pikes Peak, along with educational exhibits. The observatory was part of the … Read more

Flyers at Worldcon

Here’s a shot of COSine 2020 flyers on the freebie table at Worldcon in Dublin! A lot of people have come from the US to Dublin2019, so it seems only fair that a few people make the pilgrimage to Colorado Springs :-). And here’s a gratuitous shot of a time-traveling DeLorean stationed in front of … Read more

Guest of Honor – Eric Flint

New York Times Best-Selling Author Eric Flint has just agreed to be our Guest of Honor for COSine 2020 !! We are all very excited. Eric is probably best known for his 1632 alternate history novels (Officially The Ring of Fire Series, which now includes something like 26 novels), but he is also known for … Read more