These are maps of the Milky Way Galaxy, known in Beyond The Impossible as the Olympian Galaxy.
Original image by NASA; maps made with DraftSight.
Obviously not entirely to scale. Known planets are highlighted in red.

This is the map of the galaxy showing the various realms of the Greek gods before the start of the series.
Earth is in the Hephaestus sector, near the border with Demeter.

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WARNING: SPOILERS AHEAD after Beyond The Impossible #57

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This is the state of the galaxy after the fall of Demeter and the agreements on how to divide her territory.
Earth is now technically under Artemis, Myridia has been assigned to Hermes, and Hephaestus has inherited a significant part of the galaxy.

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WARNING: SPOILERS AHEAD after Beyond The Impossible #106
This is the state of the galaxy after the end of the Vulcan War

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The territory of Artemis, now called Diana, expands to include Earth. Dionysus, Aphrodite and Persephone greatly expand their domain. Hermes loses most of his sector to Persephone, Athena and even Hekate, while technically retaining control of Myridia.

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WARNING: SPOILERS AHEAD after Beyond The Impossible #132
This is the state of the galaxy at the beginning of the “Hearts and minds” storyline

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Hermes controls the entirety of the Persephone sector. Diana increases her conquests in the Aphrodite sector.
Hekate loses to Athena part of the territory she conquered from Hermes.

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WARNING: SPOILERS AHEAD after Beyond The Impossible #140
This is the state of the galaxy at the end of the “Hearts and minds” storyline

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The Alliance expands to include half the Galaxy, including most of the former territories of Demeter, Hermes, Hephaestus, Artemis and Persephone. Meanwhile, Apollo and Ares begin slowly expanding their territory.

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WARNING: SPOILERS AHEAD after Beyond The Impossible #166
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This is the state of the Olympian Galaxy as the Guild and the Talos Collective separate from the Alliance. Far away, Enyo makes her quiet entrance.

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WARNING: SPOILERS AHEAD after Beyond The Impossible #171

This is the state of the galaxy at the end of the “Eclipse” storyline

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WARNING: SPOILERS AHEAD after Beyond The Impossible #205

This is the state of the galaxy at the start of the “Search for the Dragon Tomb” storyline

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WARNING: SPOILERS AHEAD after Beyond The Impossible #222

This is the state of the galaxy at the end of the “Search for the Dragon Tomb” storyline

Artemis, Hekate and the Talos Collective have lost their territories. The new Hebe and Ilithyia sectors have been established, mostly as puppet states for Hera, and the destruction of the Dragon Tomb has led to the creation of the Dead Zone between the Ares and Apollo sectors.