# Apollo 8, Artemis 1 & 2 Orbit Comparison ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison.webp]] **Channel:** The Overview Effekt (@OverviewEffekt) | **Published:** Apr 4, 2026 | **Length:** 12:11 | [Watch on YouTube](https://www.youtube.com/watch?v=PNQ7MoL7erI) Playlist: Stellar Cartography > Captions were unavailable after three separate attempts (no caption tracks returned), so this outline is built from the creator's chapters, the video description, and on-screen frames. Screenshots are low-resolution YouTube storyboard preview frames because the full video download was blocked. Details not visible on screen are kept general; this note can be rebuilt if a transcript becomes available. ## Outline ### 0:00 Introduction to lunar orbits - Cold open previews the three missions in 3D: Artemis 2's looping trajectory, then the Apollo 8 orbit stack, with mission titles on screen. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0004.webp]] - A short cable-news clip follows (about 0:19), then glowing ribbon views of all three trajectories, setting up the question of how the missions' paths differ. ### 0:36 Orbital mechanics basics - Simple 2D diagrams of Earth and the Moon introduce an orbit as a closed ellipse, with **eccentricity** values shown as the circle stretches. - The **periapsis** (closest point) and **apoapsis** (farthest point) are labeled on a bar diagram, showing how burns at one point raise or lower the other. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0114.webp]] - Diagrams move into 3D around 1:53 with a spacecraft orbit on a grid. ### 2:28 Tidal locking explained - Animation of the Moon circling Earth with the same face always pointed inward: **tidal locking**. (A "Tidally Locked" label appears around 2:13.) ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0233.webp]] - The far side is never visible from Earth, which is why lunar-orbit missions lose radio contact behind the Moon. ### 3:12 Apollo 8 trajectory - Title card: **Apollo 8, 1968**. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0312.webp]] - The trajectory is rebuilt in NASA's GMAT from the mission report: initial parking orbit, the **trans-lunar injection (TLI)** burn, coast to the Moon, **lunar orbit insertion (LOI)**, ten lunar orbits, and the **trans-Earth injection (TEI)** burn. - On-screen counters near Earth (about 4:06 to 4:16) show changing numeric values (e.g. 7788, 7808, 7731) during the burn sequence; the units aren't readable at storyboard resolution. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0411.webp]] - Wide views show the long ellipse out to the Moon, then the Moon's **sphere of influence**, where lunar gravity takes over from Earth's. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0516.webp]] - A "DODECAGON?!" graphic (about 5:25) jokes about the angular look of some trajectory renders. The orbit stack is then shown around the Moon, with the return leg and reentry targeting. ### 5:42 Apollo 8 mission impact - Newspaper front pages: Chicago Tribune "MOON ORBITED!", "BULLSEYE! APOLLO 8 HOME", and the Los Angeles Times "Apollo Blasts Free, Heads for Home". ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0605.webp]] - Space Race context: archival Soviet photos and the cover of Asif Siddiqi's *Challenge to Apollo*, showing how Apollo 8 put the US ahead of the Soviet crewed lunar program. - Return to the 3D orbit stack with the Moon. ### 7:28 Lunar orbital precession - Around 6:54 to 6:59, altitude-style counters (8865, 10919) appear next to the Moon, followed by a photo of a charred heat shield and a bar chart comparing **Low Earth Orbit** with **Lunar Orbit** (one bar labeled 1300%), plus a figure about Artemis heat-shield damage. The frame suggests a comparison of lunar-return reentry against LEO return. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0709.webp]] - **Orbital precession:** the lunar orbit's orientation slowly rotates, drawn as a stack of purple-to-pink ellipses because the Moon's uneven gravity and Earth's pull tug on it. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0804.webp]] ### 8:39 Artemis 1 mission - Title card: **Artemis 1, 2022** (uncrewed Orion). - The path is plotted straight from NASA's official as-flown post-TLI ephemeris (CCSDS-OEM), with no simulation: an outbound powered flyby, a large **distant retrograde orbit (DRO)** around the Moon, and a return flyby. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t0853.webp]] ### 9:43 Artemis 2 mission design - Title card: **Artemis 2, 2026** (crewed). - Propagated in GMAT from NASA's published timeline, using differential-corrector targeting for the lunar flyby. Shows a high Earth orbit checkout loop, then a **free-return** figure-eight lunar flyby that relies on the Moon's gravity to bring the crew home without a lunar orbit insertion. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t1042.webp]] ### 10:56 Future of lunar travel - All three trajectories are overlaid in cyan, orange, and purple for a direct comparison of Apollo 8's tight lunar orbits, Artemis 1's wide DRO, and Artemis 2's flyby. ![[images/Apollo 8 Artemis 1 and 2 Orbit Comparison-t1106.webp]] ### 11:24 Educational resources - Sponsor: Brilliant (courses shown include Exploring Data Visually, Programming with Python, and Calculus), with a 20% discount link. ## Things Mentioned ### Spacecraft and Missions - Apollo 8 (1968, first crewed lunar orbit) - Artemis 1 (2022, uncrewed Orion, distant retrograde orbit) - Artemis 2 (2026, crewed Orion lunar flyby) - Orion spacecraft and heat shield - Soviet crewed lunar program (Space Race context) ### Astronomical Objects - Earth, the Moon (near side/far side), the Sun (multi-body gravity model) ### Physics Concepts - Orbital eccentricity, periapsis, apoapsis - Tidal locking - Trans-lunar injection, lunar orbit insertion, trans-Earth injection - Sphere of influence - Lunar orbital precession - Distant retrograde orbit - Free-return trajectory - Reentry flight-path angle and reentry heating - Multi-body gravitational force models ### Fiction and Music - Mass Effect music by MrHulthen ### Tools and Sources - NASA GMAT (General Mission Analysis Tool): https://software.nasa.gov/software/GSC-18094-1 - NASA JPL Horizons (via astroquery): https://ssd.jpl.nasa.gov/horizons/ - NASA Artemis I as-flown ephemeris (CCSDS-OEM): https://www.nasa.gov/missions/artemis/orion/track-nasas-artemis-i-mission-in-real-time/ - NASA Artemis II: https://www.nasa.gov/mission/artemis-ii/ - Apollo 8 Flight Journal: https://www.nasa.gov/history/afj/ap08fj/index.html - End-to-End Trajectory Optimization (NASA TechPort): https://techport.nasa.gov/projects/146883 - Asif A. Siddiqi, *Challenge to Apollo: The Soviet Union and the Space Race, 1945-1974* (2000) - Blender (with custom Python import scripts), DaVinci Resolve - Hardware: Nvidia RTX 4070, AMD Ryzen 9 9950X ### Sponsors - Brilliant: https://brilliant.org/TheOverviewEffekt/ ## Bios ### The Overview Effekt YouTube channel (@OverviewEffekt) that makes 3D visualizations of space: real locations of sci-fi settings (Stellar Cartography), sci-fi megastructures, and spaceflight history. For this video the creator propagated trajectories in GMAT, pulled NASA and JPL data, and built the scenes in Blender with custom Python scripts. Also on Nebula and Substack, and runs overvieweffekt.com. ### Apollo 8 crew Frank Borman, Jim Lovell, and William Anders flew the first crewed mission to leave Earth orbit and orbit the Moon, in December 1968. They made ten lunar orbits, took the "Earthrise" photo, and gave the Christmas Eve broadcast. ### Asif A. Siddiqi Historian of science and technology at Fordham University. His *Challenge to Apollo* (NASA history series) is a standard account of the Soviet space program and its race to the Moon. ### Artemis II crew Reid Wiseman (commander), Victor Glover (pilot), Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen: the first crew to fly Orion around the Moon.