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Reviewer #1: 5. Numerical Simulations;
It would be better if you can explain the physical meanings of the optimization result more.
The optimized state/control histories in Fig.7 is very interesting. Readers would like to question why these histories are physically¡¡optimal. For example the orbital radius first increases from 1 to 1.05 for about 50 days then decreases to 0.8. Why wouldn't it monotonically decrease from 1 to 0.8? For other example, the zenithal angle first decreases slowly but after 150th day, it rapidly decreases to 80 deg.
Why wouldn't it keep the same change rate?
Although these histories are NLP result, the physical meaning of these behaviors are not trivial.
For the completeness of this paper, I recommend that you add explanation for them.
Abstract: the solutions of general mode and geostationary mode <of> electric sail
1. Introduction 1st paragraph: analysis the stability -> analyzed the stability
2. Dynamical Equation: It would be better if the angle alpha and beta are defined(cone and clock) in this section not in the following section.


Reviewer #2: The paper investigates displaced orbits using an electric sail. This is an interesting topic and some results are shown. However, there are several parts of this paper that are not clear to evaluate further, so I have the following comments for major revision.
General£º
- This paper does not have enough fundamental explanations. Please specify the following points
1) The reason why authors selected the inertial spherical referenced frame for electric sail.
2) The reason why the transition trajectory is optimized to minimize transfer time. What does 'orbital transfer capability of electric sail' mean?
- There are some typographical errors or mathematical mistakes. Please check all equations. If there exits some mathematical mistake, the results become unreliable.
- References must be original source of a work. In addition please check if all cite numbers are correct.

Specific:
Nomenclature:
-'a_+' and subscripts '+' are confusing.
1. Introduction:
- p.2 line 6. '100kg propellant mass'. Is this not propellant mass but total spacecraft mass?
- P.2 line 10 after Fig. 1. 'The results show that the thrust force of the solar sail decays as (1/r)^2, and that of the electric sail decays as (1/r)^(7/6)'. Mengali [12] also refer Janhunen [9]. Therefore this sentence is confusing.
2. Dynamical Equations
- Eq.(2). K=cos_theta i '+' sin_theta j. Is this equation correct? If this is correct, Eq.(3) and (5) are wrong. Or K=cos_theta i '-' sin_theta j ?
- Eq.(5). 'phi'sin_theta i. typographical error. 'phi_dot'sin_theta i
- Eq.(9). There exists mathematical mistake. The third term about vector k, not '2(r_dot)(phi_dot)cos_theta', but '2r(phi_dot)(theta_dot)cos_theta'. Also, Eq. (13) has mistake.
- p.2 line 1 before Eq. (11). Is the reference [13] correct?
- Eq. (11). Please explain from what the coefficient k(kappa) is given. Is this variable value through a mission? Or specify reference about the coefficient.
3. Displaced Electric Sail Orbits
- Please check the subscripts about acceleration. 'a_+' and 'a_+d' are confusing. Eq. (11) and (12) use 'a_+', but Eq. (16) use 'a_+d'. Is this 'a_+'?  Is 'a_+' of Eq.(11) acceleration of the sail on Earth's orbit? On the other hand, what does 'a_+d' of Eq.(19) and (23) mean? Is this required acceleration on Earth's orbit or displaced orbit? Is this equal to magnitude of 'a_s'?
5. Numerical Simulations
- p.6 line 10 after '5. Numerical Simulations'. This is not principle discussion. Therefore it cannot be mentioned that 'So that the electric sail is more competent than solar sail in the application of displaced orbit.' What does 'existing technology' mean? Acceleration of a solar sail is determined by total spacecraft mass and sail area mainly. I recommend comparison of, for example, payload mass fraction because that of electric sail is shown.
- Fig. 7. History of |a_s| in Eq. (11) should be shown.
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