| Character | Description | Lines |
| Nicholas Copernicus | A visionary, creative, imaginative, who does what he needs to avoid trouble with the Inquisition, but who has a healthy disdain for its practices | 26 |
| Mrs. Copernicus | Wife of Nicholas, supportive but cautious, deathly afraid of what the Inquisition might do to her husband | 20 |
| Churchman | A leader of the Inquisition | 7 |
| Guard #1 | Guard in the Inquisitions forces, bumbling, lazy | 3 |
| Guard #2 | Guard in the Inquisitions forces, bumbling, lazy | 3 |
| Guard #3 | Guard in the Inquisitions forces, bumbling, lazy, and not in very good physical shape | 1 |
| Johannes | Friend to Nicholas, an astronomer | 5 |
| Wilhelm | Friend to Nicholas, an astronomer | 4 |
| Hans | Friend to Nicholas, an astronomer | 4 |
| Frederika | Friend to Nicholas, an astronomer | 4 |
| Narrator #1 | Storyteller | 9 |
| Narrator #2 | Storyteller | 9 |
| Character | Description | Lines |
| Galileo Galilei | Famous astronomer, scientist and artist | 42 |
| Pietro | His servant, not very bright | 9 |
| Marco | His servant, well meaning but uneducated | 17 |
| Luisa | An astronomer, often amazed at the wonders of the stars | 10 |
| Gianni | An astronomer, but very cynical; believes nothing unless it is proven to him | 9 |
| Paula | An astronomer, very excitable; takes delight in everything new | 8 |
| Renaldo | An astronomer, really spaced out; the newness of discoveries amazes him so much he day dreams | 10 |
| Maria | An astronomer, very afraid of the Church | 8 |
| Cardinal | The highest Church official in Pisa, very good at politics | 13 |
| Priest #1 | A hot head, gets angry if opposed by anyone | 9 |
| Priest #2 | Very powerful person, does not like to be questioned. | 9 |
| Narrator #1 | Storyteller | 3 |
| Narrator #2 | Storyteller | 2 |
| Guards | Official private police force of the Church | none |
| Character | Description | Lines |
| Isaac Newton | Famous astronomer, scientist and artist. He is a total scatter brain, brilliant, but living in his own world. | 13 |
| Mother | Isaac’s mother, Hannah Newton, a well meaning farm woman, who does not understand Isaac. Convinced that Isaac will never amount to anything, that he is scatter-brained and lazy | 13 |
| Barnabas Smith | Isaac’s step-father. A clergyman. Loves Isaac, and though he recognizes Isaac’s shortcomings, he also glimpses his genius. | 14 |
| Narrator #1: | Storyteller | 3 |
| Narrator #2: | Storyteller | 2 |
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