This is a simple tutorial is about how to create a shader moon in time. Into your Godot project add a Sprite to Node2D. Add a New CanvasItemMaterial and then select Convert to ShaderMaterial to the Sprite. Open this shader and fill with this shader source code:
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shader_type canvas_item; render_mode blend_mix; void fragment(){ float time = TIME; vec2 uv = UV; //moon float t = fract(time*0.01); vec2 p = uv; p.y += p.y*0.5 + (t  1.8); p.x += (t1.8)+p.x*0.5; vec3 basecol = vec3(199.0,190.0,100.0); basecol.r += smoothstep( 0.2, 10.1, t*0.1); basecol.g += smoothstep( 0.2, 10.1, t*0.1); basecol.b += smoothstep( 0.2, 10.1, t*0.1); vec3 suncol=basecol; vec2 m = vec2(0.1,0.1); suncol = suncol*smoothstep(0.1, 0.01 , length(p)) * smoothstep(1.5,0.1,uv.y); COLOR = vec4(suncol,0.1); } 